19877156464 has 160 divisors (see below), whose sum is σ = 43974560448. Its totient is φ = 8626176000.

The previous prime is 19877156443. The next prime is 19877156471. The reversal of 19877156464 is 46465177891.

It is a junction number, because it is equal to n+sod(n) for n = 19877156399 and 19877156408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102990352 + ... + 102990544.

Almost surely, 2^19877156464 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 19877156464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21987280224).

19877156464 is an abundant number, since it is smaller than the sum of its proper divisors (24097403984).

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

19877156464 is a wasteful number, since it uses less digits than its factorization.

19877156464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507 (or 501 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 58.

The spelling of 19877156464 in words is "nineteen billion, eight hundred seventy-seven million, one hundred fifty-six thousand, four hundred sixty-four".