12500687691 has 8 divisors (see below), whose sum is σ = 18519537360. Its totient is φ = 8333791776.

The previous prime is 12500687671. The next prime is 12500687723. The reversal of 12500687691 is 19678600521.

12500687691 is a `hidden beast` number, since 1 + 2 + 500 + 6 + 87 + 69 + 1 = 666.

It is not a de Polignac number, because 12500687691 - 2⁹ = 12500687179 is a prime.

It is a super-2 number, since 2×12500687691² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12500687621) 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, 231494190 + ... + 231494243.

It is an arithmetic number, because the mean of its divisors is an integer number (2314942170).

Almost surely, 2^12500687691 is an apocalyptic number.

12500687691 is a deficient number, since it is larger than the sum of its proper divisors (6018849669).

12500687691 is an equidigital number, since it uses as much as digits as its factorization.

12500687691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462988442 (or 462988436 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 12500687691 in words is "twelve billion, five hundred million, six hundred eighty-seven thousand, six hundred ninety-one".