77646044725 has 12 divisors (see below), whose sum is σ = 96284665636. Its totient is φ = 62114532480.

The previous prime is 77646044699. The next prime is 77646044731. The reversal of 77646044725 is 52744064677.

It can be written as a sum of positive squares in 6 ways, for example, as 174002481 + 77472042244 = 13191^2 + 278338^2 .

It is not a de Polignac number, because 77646044725 - 2²¹ = 77643947573 is a prime.

It is a super-2 number, since 2×77646044725² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1041289 + ... + 1113361.

Almost surely, 2^77646044725 is an apocalyptic number.

It is an amenable number.

77646044725 is a deficient number, since it is larger than the sum of its proper divisors (18638620911).

77646044725 is a wasteful number, since it uses less digits than its factorization.

77646044725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115176 (or 115171 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 52.

The spelling of 77646044725 in words is "seventy-seven billion, six hundred forty-six million, forty-four thousand, seven hundred twenty-five".