19639894692 has 96 divisors (see below), whose sum is σ = 54438451200. Its totient is φ = 5443804800.

The previous prime is 19639894633. The next prime is 19639894723. The reversal of 19639894692 is 29649893691.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62284 + ... + 207747.

It is an arithmetic number, because the mean of its divisors is an integer number (567067200).

Almost surely, 2^19639894692 is an apocalyptic number.

19639894692 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19639894692 is an abundant number, since it is smaller than the sum of its proper divisors (34798556508).

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

19639894692 is a wasteful number, since it uses less digits than its factorization.

19639894692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270097 (or 270095 counting only the distinct ones).

The product of its digits is 45349632, while the sum is 66.

The spelling of 19639894692 in words is "nineteen billion, six hundred thirty-nine million, eight hundred ninety-four thousand, six hundred ninety-two".