77696569678 has 32 divisors (see below), whose sum is σ = 145255541760. Its totient is φ = 30348021600.

The previous prime is 77696569661. The next prime is 77696569703. The reversal of 77696569678 is 87696569677.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2687548 + ... + 2716303.

It is an arithmetic number, because the mean of its divisors is an integer number (4539235680).

Almost surely, 2^77696569678 is an apocalyptic number.

77696569678 is a deficient number, since it is larger than the sum of its proper divisors (67558972082).

77696569678 is a wasteful number, since it uses less digits than its factorization.

77696569678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5403952.

The product of its digits is 1440270720, while the sum is 76.

Subtracting 77696569678 from its reverse (87696569677), we obtain a palindrome (9999999999).

The spelling of 77696569678 in words is "seventy-seven billion, six hundred ninety-six million, five hundred sixty-nine thousand, six hundred seventy-eight".