77331988568 has 32 divisors (see below), whose sum is σ = 153700850160. Its totient is φ = 36350254080.

The previous prime is 77331988529. The next prime is 77331988571. The reversal of 77331988568 is 86588913377.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201893 + ... + 442068.

Almost surely, 2^77331988568 is an apocalyptic number.

It is an amenable number.

77331988568 is a deficient number, since it is larger than the sum of its proper divisors (76368861592).

77331988568 is a wasteful number, since it uses less digits than its factorization.

77331988568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644867 (or 644863 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 65.

The spelling of 77331988568 in words is "seventy-seven billion, three hundred thirty-one million, nine hundred eighty-eight thousand, five hundred sixty-eight".