12691541500 has 48 divisors (see below), whose sum is σ = 30238187616. Its totient is φ = 4615104000.

The previous prime is 12691541497. The next prime is 12691541557. The reversal of 12691541500 is 514519621.

It is a happy number.

It is a super-2 number, since 2×12691541500² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1148277 + ... + 1159276.

It is an arithmetic number, because the mean of its divisors is an integer number (629962242).

Almost surely, 2^12691541500 is an apocalyptic number.

12691541500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12691541500 is an abundant number, since it is smaller than the sum of its proper divisors (17546646116).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12691541500 is a wasteful number, since it uses less digits than its factorization.

12691541500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307583 (or 2307571 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 34.

The spelling of 12691541500 in words is "twelve billion, six hundred ninety-one million, five hundred forty-one thousand, five hundred".