12517591842 has 72 divisors (see below), whose sum is σ = 32637419100. Its totient is φ = 3453121728.

The previous prime is 12517591789. The next prime is 12517591847. The reversal of 12517591842 is 24819571521.

12517591842 is a `hidden beast` number, since 1 + 2 + 5 + 17 + 591 + 8 + 42 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12021148881 + 496442961 = 109641^2 + 22281^2 .

It is not an unprimeable number, because it can be changed into a prime (12517591847) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 219117 + ... + 270272.

Almost surely, 2^12517591842 is an apocalyptic number.

12517591842 is an abundant number, since it is smaller than the sum of its proper divisors (20119827258).

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

12517591842 is a wasteful number, since it uses less digits than its factorization.

12517591842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489440 (or 489430 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The spelling of 12517591842 in words is "twelve billion, five hundred seventeen million, five hundred ninety-one thousand, eight hundred forty-two".