19849255902 has 80 divisors (see below), whose sum is σ = 50919200640. Its totient is φ = 5661364752.

The previous prime is 19849255819. The next prime is 19849255903. The reversal of 19849255902 is 20955294891.

19849255902 is a `hidden beast` number, since 1 + 9 + 8 + 49 + 2 + 5 + 590 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19849255903) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 650749 + ... + 680567.

It is an arithmetic number, because the mean of its divisors is an integer number (636490008).

Almost surely, 2^19849255902 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19849255902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25459600320).

19849255902 is an abundant number, since it is smaller than the sum of its proper divisors (31069944738).

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

19849255902 is a wasteful number, since it uses less digits than its factorization.

19849255902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30427 (or 30418 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 19849255902 in words is "nineteen billion, eight hundred forty-nine million, two hundred fifty-five thousand, nine hundred two".