71687970777 has 4 divisors (see below), whose sum is σ = 95583961040. Its totient is φ = 47791980516.

The previous prime is 71687970749. The next prime is 71687970791. The reversal of 71687970777 is 77707978617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 71687970777 - 2¹⁵ = 71687938009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71687970707) 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, 11947995127 + ... + 11947995132.

It is an arithmetic number, because the mean of its divisors is an integer number (23895990260).

Almost surely, 2^71687970777 is an apocalyptic number.

It is an amenable number.

71687970777 is a deficient number, since it is larger than the sum of its proper divisors (23895990263).

71687970777 is a wasteful number, since it uses less digits than its factorization.

71687970777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23895990262.

The product of its (nonzero) digits is 50824368, while the sum is 66.

The spelling of 71687970777 in words is "seventy-one billion, six hundred eighty-seven million, nine hundred seventy thousand, seven hundred seventy-seven".