19638618900 has 36 divisors (see below), whose sum is σ = 56821071552. Its totient is φ = 5236964960.

The previous prime is 19638618893. The next prime is 19638618941. The reversal of 19638618900 is 981683691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32730732 + ... + 32731331.

Almost surely, 2^19638618900 is an apocalyptic number.

19638618900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19638618900 is an abundant number, since it is smaller than the sum of its proper divisors (37182452652).

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

19638618900 is a wasteful number, since it uses less digits than its factorization.

19638618900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65462080 (or 65462073 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 51.

The spelling of 19638618900 in words is "nineteen billion, six hundred thirty-eight million, six hundred eighteen thousand, nine hundred".