19532878164 has 120 divisors (see below), whose sum is σ = 52815721728. Its totient is φ = 6288295680.

The previous prime is 19532878139. The next prime is 19532878201. The reversal of 19532878164 is 46187823591.

19532878164 is a `hidden beast` number, since 1 + 95 + 328 + 78 + 164 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 19532878164.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5894172 + ... + 5897484.

Almost surely, 2^19532878164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19532878164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26407860864).

19532878164 is an abundant number, since it is smaller than the sum of its proper divisors (33282843564).

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

19532878164 is a wasteful number, since it uses less digits than its factorization.

19532878164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3947 (or 3936 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 19532878164 in words is "nineteen billion, five hundred thirty-two million, eight hundred seventy-eight thousand, one hundred sixty-four".