19956249522 has 72 divisors (see below), whose sum is σ = 47963255340. Its totient is φ = 5991796800.

The previous prime is 19956249497. The next prime is 19956249563. The reversal of 19956249522 is 22594265991.

19956249522 is a `hidden beast` number, since 1 + 9 + 9 + 5 + 624 + 9 + 5 + 2 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19000141281 + 956108241 = 137841^2 + 30921^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 195372 + ... + 279432.

Almost surely, 2^19956249522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19956249522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23981627670).

19956249522 is an abundant number, since it is smaller than the sum of its proper divisors (28007005818).

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

19956249522 is a wasteful number, since it uses less digits than its factorization.

19956249522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84200 (or 84186 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The spelling of 19956249522 in words is "nineteen billion, nine hundred fifty-six million, two hundred forty-nine thousand, five hundred twenty-two".