77964860518 has 4 divisors (see below), whose sum is σ = 116947290780. Its totient is φ = 38982430258.

The previous prime is 77964860497. The next prime is 77964860537. The reversal of 77964860518 is 81506846977.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81506846977 = 2693 ⋅30266189.

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, 19491215128 + ... + 19491215131.

It is an arithmetic number, because the mean of its divisors is an integer number (29236822695).

Almost surely, 2^77964860518 is an apocalyptic number.

77964860518 is a deficient number, since it is larger than the sum of its proper divisors (38982430262).

77964860518 is a wasteful number, since it uses less digits than its factorization.

77964860518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38982430261.

The product of its (nonzero) digits is 20321280, while the sum is 61.

The spelling of 77964860518 in words is "seventy-seven billion, nine hundred sixty-four million, eight hundred sixty thousand, five hundred eighteen".