12691519412 has 72 divisors (see below), whose sum is σ = 27083250432. Its totient is φ = 5153241600.

The previous prime is 12691519387. The next prime is 12691519427. The reversal of 12691519412 is 21491519621.

It is a super-2 number, since 2×12691519412² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12691519412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 202988 + ... + 258044.

It is an arithmetic number, because the mean of its divisors is an integer number (376156256).

Almost surely, 2^12691519412 is an apocalyptic number.

It is an amenable number.

12691519412 is an abundant number, since it is smaller than the sum of its proper divisors (14391731020).

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

12691519412 is a wasteful number, since it uses less digits than its factorization.

12691519412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55129 (or 55114 counting only the distinct ones).

The product of its digits is 38880, while the sum is 41.

The spelling of 12691519412 in words is "twelve billion, six hundred ninety-one million, five hundred nineteen thousand, four hundred twelve".