77665713251 has 4 divisors (see below), whose sum is σ = 88760815152. Its totient is φ = 66570611352.

The previous prime is 77665713241. The next prime is 77665713263. The reversal of 77665713251 is 15231756677.

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

It is not a de Polignac number, because 77665713251 - 2⁶ = 77665713187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77665713251.

It is not an unprimeable number, because it can be changed into a prime (77665713221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5547550940 + ... + 5547550953.

It is an arithmetic number, because the mean of its divisors is an integer number (22190203788).

Almost surely, 2^77665713251 is an apocalyptic number.

77665713251 is a deficient number, since it is larger than the sum of its proper divisors (11095101901).

77665713251 is a wasteful number, since it uses less digits than its factorization.

77665713251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11095101900.

The product of its digits is 1852200, while the sum is 50.

The spelling of 77665713251 in words is "seventy-seven billion, six hundred sixty-five million, seven hundred thirteen thousand, two hundred fifty-one".