18715877320464 has 180 divisors, whose sum is σ = 54560524217316. Its totient is φ = 5988676119552.

The previous prime is 18715877320429. The next prime is 18715877320507. The reversal of 18715877320464 is 46402377851781.

It is a happy number.

18715877320464 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 5 + 87 + 73 + 20 + 464 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 3868727080464 + 14847150240000 = 1966908^2 + 3853200^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20504334 + ... + 21397650.

Almost surely, 2^{18715877320464} 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 18715877320464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27280262108658).

18715877320464 is an abundant number, since it is smaller than the sum of its proper divisors (35844646896852).

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

18715877320464 is a wasteful number, since it uses less digits than its factorization.

18715877320464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893562 (or 893524 counting only the distinct ones).

The product of its (nonzero) digits is 63221760, while the sum is 63.

The spelling of 18715877320464 in words is "eighteen trillion, seven hundred fifteen billion, eight hundred seventy-seven million, three hundred twenty thousand, four hundred sixty-four".