76436221665 has 16 divisors (see below), whose sum is σ = 128734689600. Its totient is φ = 38620406592.

The previous prime is 76436221657. The next prime is 76436221681. The reversal of 76436221665 is 56612263467.

It is not a de Polignac number, because 76436221665 - 2³ = 76436221657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134098350 + ... + 134098919.

It is an arithmetic number, because the mean of its divisors is an integer number (8045918100).

Almost surely, 2^76436221665 is an apocalyptic number.

It is an amenable number.

76436221665 is a deficient number, since it is larger than the sum of its proper divisors (52298467935).

76436221665 is a wasteful number, since it uses less digits than its factorization.

76436221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268197296.

The product of its digits is 2177280, while the sum is 48.

The spelling of 76436221665 in words is "seventy-six billion, four hundred thirty-six million, two hundred twenty-one thousand, six hundred sixty-five".