76777766681 has 64 divisors (see below), whose sum is σ = 99954032640. Its totient is φ = 57231360000.

The previous prime is 76777766633. The next prime is 76777766701. The reversal of 76777766681 is 18666777767.

It is a cyclic number.

It is not a de Polignac number, because 76777766681 - 2⁶ = 76777766617 is a prime.

It is a super-2 number, since 2×76777766681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (76777765681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 99840665 + ... + 99841433.

It is an arithmetic number, because the mean of its divisors is an integer number (1561781760).

Almost surely, 2^76777766681 is an apocalyptic number.

It is an amenable number.

76777766681 is a deficient number, since it is larger than the sum of its proper divisors (23176265959).

76777766681 is a wasteful number, since it uses less digits than its factorization.

76777766681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246.

The product of its digits is 174254976, while the sum is 68.

The spelling of 76777766681 in words is "seventy-six billion, seven hundred seventy-seven million, seven hundred sixty-six thousand, six hundred eighty-one".