80726825691 has 8 divisors (see below), whose sum is σ = 119595297360. Its totient is φ = 53817883776.

The previous prime is 80726825659. The next prime is 80726825693. The reversal of 80726825691 is 19652862708.

80726825691 is a `hidden beast` number, since 8 + 0 + 72 + 6 + 8 + 2 + 569 + 1 = 666.

It is not a de Polignac number, because 80726825691 - 2⁵ = 80726825659 is a prime.

It is a super-2 number, since 2×80726825691² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80726825693) 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, 1494941190 + ... + 1494941243.

It is an arithmetic number, because the mean of its divisors is an integer number (14949412170).

Almost surely, 2^80726825691 is an apocalyptic number.

80726825691 is a deficient number, since it is larger than the sum of its proper divisors (38868471669).

80726825691 is a wasteful number, since it uses less digits than its factorization.

80726825691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2989882442 (or 2989882436 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 80726825691 in words is "eighty billion, seven hundred twenty-six million, eight hundred twenty-five thousand, six hundred ninety-one".