44545000781 has 4 divisors (see below), whose sum is σ = 44551069500. Its totient is φ = 44538932064.

The previous prime is 44545000763. The next prime is 44545000783. The reversal of 44545000781 is 18700054544.

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 12587718025 + 31957282756 = 112195^2 + 178766^2 .

It is a cyclic number.

It is not a de Polignac number, because 44545000781 - 2¹⁰ = 44544999757 is a prime.

It is a super-2 number, since 2×44545000781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44545000783) 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 3 ways as a sum of consecutive naturals, for example, 3023336 + ... + 3038033.

It is an arithmetic number, because the mean of its divisors is an integer number (11137767375).

Almost surely, 2^44545000781 is an apocalyptic number.

44545000781 is the 94388-th centered decagonal number.

It is an amenable number.

44545000781 is a deficient number, since it is larger than the sum of its proper divisors (6068719).

44545000781 is an equidigital number, since it uses as much as digits as its factorization.

44545000781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6068718.

The product of its (nonzero) digits is 89600, while the sum is 38.

The spelling of 44545000781 in words is "forty-four billion, five hundred forty-five million, seven hundred eighty-one", and thus it is an aban number.