19668053637 has 10 divisors (see below), whose sum is σ = 29380672838. Its totient is φ = 13112035704.

The previous prime is 19668053617. The next prime is 19668053677. The reversal of 19668053637 is 73635086691.

19668053637 is a `hidden beast` number, since 19 + 6 + 68 + 0 + 536 + 37 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10427268996 + 9240784641 = 102114^2 + 96129^2 .

It is not a de Polignac number, because 19668053637 - 2¹⁶ = 19667988101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668053617) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 121407658 + ... + 121407819.

Almost surely, 2^19668053637 is an apocalyptic number.

It is an amenable number.

19668053637 is a deficient number, since it is larger than the sum of its proper divisors (9712619201).

19668053637 is an equidigital number, since it uses as much as digits as its factorization.

19668053637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242815489 (or 242815480 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 54.

The spelling of 19668053637 in words is "nineteen billion, six hundred sixty-eight million, fifty-three thousand, six hundred thirty-seven".