19481766864 has 40 divisors (see below), whose sum is σ = 57517598400. Its totient is φ = 5566219008.

The previous prime is 19481766833. The next prime is 19481766877. The reversal of 19481766864 is 46866718491.

It is a junction number, because it is equal to n+sod(n) for n = 19481766798 and 19481766807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28990389 + ... + 28991060.

It is an arithmetic number, because the mean of its divisors is an integer number (1437939960).

Almost surely, 2^19481766864 is an apocalyptic number.

19481766864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19481766864 is an abundant number, since it is smaller than the sum of its proper divisors (38035831536).

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

19481766864 is a wasteful number, since it uses less digits than its factorization.

19481766864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57981467 (or 57981461 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 60.

The spelling of 19481766864 in words is "nineteen billion, four hundred eighty-one million, seven hundred sixty-six thousand, eight hundred sixty-four".