19923772257 has 10 divisors (see below), whose sum is σ = 29762672258. Its totient is φ = 13282514784.

The previous prime is 19923772223. The next prime is 19923772279. The reversal of 19923772257 is 75227732991.

It is a happy number.

19923772257 is a `hidden beast` number, since 1 + 99 + 237 + 72 + 257 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10377700641 + 9546071616 = 101871^2 + 97704^2 .

It is not a de Polignac number, because 19923772257 - 2⁷ = 19923772129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19923772207) 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, 122986168 + ... + 122986329.

Almost surely, 2^19923772257 is an apocalyptic number.

It is an amenable number.

19923772257 is a deficient number, since it is larger than the sum of its proper divisors (9838900001).

19923772257 is an equidigital number, since it uses as much as digits as its factorization.

19923772257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245972509 (or 245972500 counting only the distinct ones).

The product of its digits is 3333960, while the sum is 54.

The spelling of 19923772257 in words is "nineteen billion, nine hundred twenty-three million, seven hundred seventy-two thousand, two hundred fifty-seven".