19974588858436 has 81 divisors (see below), whose sum is σ = 37108248503319. Its totient is φ = 9406540958976.

The previous prime is 19974588858397. The next prime is 19974588858457. The reversal of 19974588858436 is 63485888547991.

The square root of 19974588858436 is 4469294.

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

It can be written as a sum of positive squares in 4 ways, for example, as 339664900 + 19974249193536 = 18430^2 + 4469256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 57233778790 + ... + 57233779138.

Almost surely, 2^{19974588858436} is an apocalyptic number.

19974588858436 is the 4469294-th square number.

It is an amenable number.

19974588858436 is a deficient number, since it is larger than the sum of its proper divisors (17133659644883).

19974588858436 is an frugal number, since it uses more digits than its factorization.

19974588858436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 707 counting only the distinct ones).

The product of its digits is 16721510400, while the sum is 85.

The spelling of 19974588858436 in words is "nineteen trillion, nine hundred seventy-four billion, five hundred eighty-eight million, eight hundred fifty-eight thousand, four hundred thirty-six".