77665656676 has 6 divisors (see below), whose sum is σ = 135914899190. Its totient is φ = 38832828336.

The previous prime is 77665656667. The next prime is 77665656791. The reversal of 77665656676 is 67665656677.

It can be written as a sum of positive squares in only one way, i.e., 73806762276 + 3858894400 = 271674^2 + 62120^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9708207081 + ... + 9708207088.

Almost surely, 2^77665656676 is an apocalyptic number.

It is an amenable number.

77665656676 is a deficient number, since it is larger than the sum of its proper divisors (58249242514).

77665656676 is a wasteful number, since it uses less digits than its factorization.

77665656676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19416414173 (or 19416414171 counting only the distinct ones).

The product of its digits is 400075200, while the sum is 67.

Subtracting from 77665656676 its reverse (67665656677), we obtain a palindrome (9999999999).

The spelling of 77665656676 in words is "seventy-seven billion, six hundred sixty-five million, six hundred fifty-six thousand, six hundred seventy-six".