19664309120 has 32 divisors (see below), whose sum is σ = 47009990520. Its totient is φ = 7865723392.

The previous prime is 19664309107. The next prime is 19664309129. The reversal of 19664309120 is 2190346691.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664309129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15362102 + ... + 15363381.

Almost surely, 2^19664309120 is an apocalyptic number.

19664309120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19664309120 is an abundant number, since it is smaller than the sum of its proper divisors (27345681400).

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

19664309120 is an equidigital number, since it uses as much as digits as its factorization.

19664309120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30725502 (or 30725490 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 19664309120 in words is "nineteen billion, six hundred sixty-four million, three hundred nine thousand, one hundred twenty".