19874561274538 has 32 divisors (see below), whose sum is σ = 31462337811600. Its totient is φ = 9402856759296.

The previous prime is 19874561274517. The next prime is 19874561274629. The reversal of 19874561274538 is 83547216547891.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 197680719769 + 19676880554769 = 444613^2 + 4435863^2 .

It is a super-2 number, since 2×19874561274538² (a number of 27 digits) contains 22 as substring.

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, 16452831 + ... + 17619442.

Almost surely, 2^{19874561274538} is an apocalyptic number.

19874561274538 is a deficient number, since it is larger than the sum of its proper divisors (11587776537062).

19874561274538 is a wasteful number, since it uses less digits than its factorization.

19874561274538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34072506.

The product of its digits is 406425600, while the sum is 70.

The spelling of 19874561274538 in words is "nineteen trillion, eight hundred seventy-four billion, five hundred sixty-one million, two hundred seventy-four thousand, five hundred thirty-eight".