76506557777021 has 8 divisors (see below), whose sum is σ = 77950602630144. Its totient is φ = 75062532364560.

The previous prime is 76506557776991. The next prime is 76506557777053. The reversal of 76506557777021 is 12077775560567.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76506557777021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76506557777071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3210176 + ... + 12779606.

It is an arithmetic number, because the mean of its divisors is an integer number (9743825328768).

Almost surely, 2^{76506557777021} is an apocalyptic number.

It is an amenable number.

76506557777021 is a deficient number, since it is larger than the sum of its proper divisors (1444044853123).

76506557777021 is a wasteful number, since it uses less digits than its factorization.

76506557777021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9720331.

The product of its (nonzero) digits is 151263000, while the sum is 65.

The spelling of 76506557777021 in words is "seventy-six trillion, five hundred six billion, five hundred fifty-seven million, seven hundred seventy-seven thousand, twenty-one".