12891817524 has 48 divisors (see below), whose sum is σ = 30195693248. Its totient is φ = 4280905728.

The previous prime is 12891817513. The next prime is 12891817583. The reversal of 12891817524 is 42571819821.

It is a happy number.

It is a super-2 number, since 2×12891817524² (a number of 21 digits) contains 22 as substring.

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, 5491719 + ... + 5494065.

Almost surely, 2^12891817524 is an apocalyptic number.

It is an amenable number.

12891817524 is an abundant number, since it is smaller than the sum of its proper divisors (17303875724).

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

12891817524 is a wasteful number, since it uses less digits than its factorization.

12891817524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3904 (or 3902 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The spelling of 12891817524 in words is "twelve billion, eight hundred ninety-one million, eight hundred seventeen thousand, five hundred twenty-four".