77809966502 has 4 divisors (see below), whose sum is σ = 116714949756. Its totient is φ = 38904983250.

The previous prime is 77809966463. The next prime is 77809966513. The reversal of 77809966502 is 20566990877.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19452491624 + ... + 19452491627.

It is an arithmetic number, because the mean of its divisors is an integer number (29178737439).

Almost surely, 2^77809966502 is an apocalyptic number.

77809966502 is a deficient number, since it is larger than the sum of its proper divisors (38904983254).

77809966502 is a wasteful number, since it uses less digits than its factorization.

77809966502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38904983253.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 77809966502 in words is "seventy-seven billion, eight hundred nine million, nine hundred sixty-six thousand, five hundred two".