77695645680 has 120 divisors (see below), whose sum is σ = 261008940192. Its totient is φ = 20712402432.

The previous prime is 77695645679. The next prime is 77695645697. The reversal of 77695645680 is 8654659677.

77695645680 is a `hidden beast` number, since 7 + 7 + 6 + 9 + 5 + 64 + 568 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×77695645680² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2582082 + ... + 2611998.

Almost surely, 2^77695645680 is an apocalyptic number.

It is an amenable number.

77695645680 is an abundant number, since it is smaller than the sum of its proper divisors (183313294512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77695645680 is a wasteful number, since it uses less digits than its factorization.

77695645680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33543 (or 33534 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 63.

The spelling of 77695645680 in words is "seventy-seven billion, six hundred ninety-five million, six hundred forty-five thousand, six hundred eighty".