44544621645 has 12 divisors (see below), whose sum is σ = 77210677596. Its totient is φ = 23757131520.

The previous prime is 44544621643. The next prime is 44544621689. The reversal of 44544621645 is 54612644544.

44544621645 is a `hidden beast` number, since 4 + 4 + 544 + 62 + 1 + 6 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 25455883401 + 19088738244 = 159549^2 + 138162^2 .

It is not a de Polignac number, because 44544621645 - 2¹ = 44544621643 is a prime.

It is a super-3 number, since 3×44544621645³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 989880481 = 44544621645 / (4 + 4 + 5 + 4 + 4 + 6 + 2 + 1 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 44544621645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44544621643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 494940196 + ... + 494940285.

It is an arithmetic number, because the mean of its divisors is an integer number (6434223133).

Almost surely, 2^44544621645 is an apocalyptic number.

44544621645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

44544621645 is a deficient number, since it is larger than the sum of its proper divisors (32666055951).

44544621645 is a wasteful number, since it uses less digits than its factorization.

44544621645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 989880492 (or 989880489 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 45.

The spelling of 44544621645 in words is "forty-four billion, five hundred forty-four million, six hundred twenty-one thousand, six hundred forty-five".