19115274564 has 45 divisors (see below), whose sum is σ = 49977610221. Its totient is φ = 6370928640.

The previous prime is 19115274559. The next prime is 19115274583. The reversal of 19115274564 is 46547251191.

The square root of 19115274564 is 138258.

It is a perfect power (a square), and thus also a powerful number.

19115274564 is a `hidden beast` number, since 1 + 9 + 1 + 15 + 2 + 74 + 564 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13399914564 + 5715360000 = 115758^2 + 75600^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2484804 + ... + 2492484.

Almost surely, 2^19115274564 is an apocalyptic number.

19115274564 is the 138258-th square number.

It is an amenable number.

19115274564 is an abundant number, since it is smaller than the sum of its proper divisors (30862335657).

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

19115274564 is an frugal number, since it uses more digits than its factorization.

19115274564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15378 (or 7686 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 19115274564 in words is "nineteen billion, one hundred fifteen million, two hundred seventy-four thousand, five hundred sixty-four".