76721734260531 has 10 divisors (see below), whose sum is σ = 114609010438692. Its totient is φ = 51147822840300.

The previous prime is 76721734260529. The next prime is 76721734260541. The reversal of 76721734260531 is 13506243712767.

76721734260531 is a `hidden beast` number, since 7 + 6 + 7 + 2 + 1 + 7 + 3 + 42 + 60 + 531 = 666.

It is not a de Polignac number, because 76721734260531 - 2¹ = 76721734260529 is a prime.

It is a super-5 number, since 5×76721734260531⁵ (a number of 71 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (76721734260541) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 473590952145 + ... + 473590952306.

Almost surely, 2^{76721734260531} is an apocalyptic number.

76721734260531 is a deficient number, since it is larger than the sum of its proper divisors (37887276178161).

76721734260531 is an equidigital number, since it uses as much as digits as its factorization.

76721734260531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947181904463 (or 947181904454 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 76721734260531 in words is "seventy-six trillion, seven hundred twenty-one billion, seven hundred thirty-four million, two hundred sixty thousand, five hundred thirty-one".