44164402561 has 4 divisors (see below), whose sum is σ = 46762308612. Its totient is φ = 41566496512.

The previous prime is 44164402559. The next prime is 44164402603. The reversal of 44164402561 is 16520446144.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26433882225 + 17730520336 = 162585^2 + 133156^2 .

It is a cyclic number.

It is not a de Polignac number, because 44164402561 - 2¹ = 44164402559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 44164402561.

It is not an unprimeable number, because it can be changed into a prime (44164402511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1298953000 + ... + 1298953033.

It is an arithmetic number, because the mean of its divisors is an integer number (11690577153).

Almost surely, 2^44164402561 is an apocalyptic number.

It is an amenable number.

44164402561 is a deficient number, since it is larger than the sum of its proper divisors (2597906051).

44164402561 is a wasteful number, since it uses less digits than its factorization.

44164402561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2597906050.

The product of its (nonzero) digits is 92160, while the sum is 37.

The spelling of 44164402561 in words is "forty-four billion, one hundred sixty-four million, four hundred two thousand, five hundred sixty-one".