19963640052 has 30 divisors (see below), whose sum is σ = 52188899378. Its totient is φ = 6654546576.

The previous prime is 19963640029. The next prime is 19963640063. The reversal of 19963640052 is 25004636991.

19963640052 is a `hidden beast` number, since 1 + 9 + 9 + 636 + 4 + 0 + 0 + 5 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16158477456 + 3805162596 = 127116^2 + 61686^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 30807763 + ... + 30808410.

Almost surely, 2^19963640052 is an apocalyptic number.

19963640052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19963640052 is an abundant number, since it is smaller than the sum of its proper divisors (32225259326).

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

19963640052 is a wasteful number, since it uses less digits than its factorization.

19963640052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61616189 (or 61616178 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 19963640052 in words is "nineteen billion, nine hundred sixty-three million, six hundred forty thousand, fifty-two".