19401765136 has 60 divisors (see below), whose sum is σ = 42108750180. Its totient is φ = 8645844480.

The previous prime is 19401765133. The next prime is 19401765179. The reversal of 19401765136 is 63156710491.

It can be written as a sum of positive squares in 6 ways, for example, as 7266539536 + 12135225600 = 85244^2 + 110160^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19401765092 and 19401765101.

It is not an unprimeable number, because it can be changed into a prime (19401765133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45295 + ... + 202126.

It is an arithmetic number, because the mean of its divisors is an integer number (701812503).

Almost surely, 2^19401765136 is an apocalyptic number.

19401765136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19401765136 is an abundant number, since it is smaller than the sum of its proper divisors (22706985044).

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

19401765136 is a wasteful number, since it uses less digits than its factorization.

19401765136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247484 (or 247465 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 19401765136 in words is "nineteen billion, four hundred one million, seven hundred sixty-five thousand, one hundred thirty-six".