12531637845 has 32 divisors (see below), whose sum is σ = 22285987200. Its totient is φ = 6681284352.

The previous prime is 12531637813. The next prime is 12531637889. The reversal of 12531637845 is 54873613521.

It is a happy number.

12531637845 is a `hidden beast` number, since 1 + 2 + 5 + 3 + 1 + 637 + 8 + 4 + 5 = 666.

It is not a de Polignac number, because 12531637845 - 2⁵ = 12531637813 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 12531637845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 433246 + ... + 461264.

It is an arithmetic number, because the mean of its divisors is an integer number (696437100).

Almost surely, 2^12531637845 is an apocalyptic number.

12531637845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12531637845 is a deficient number, since it is larger than the sum of its proper divisors (9754349355).

12531637845 is a wasteful number, since it uses less digits than its factorization.

12531637845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31346 (or 31340 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 12531637845 in words is "twelve billion, five hundred thirty-one million, six hundred thirty-seven thousand, eight hundred forty-five".