18880578513 has 6 divisors (see below), whose sum is σ = 27271946754. Its totient is φ = 12587052336.

The previous prime is 18880578473. The next prime is 18880578517. The reversal of 18880578513 is 31587508881.

18880578513 is a `hidden beast` number, since 18 + 8 + 8 + 0 + 578 + 51 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18661745664 + 218832849 = 136608^2 + 14793^2 .

It is not a de Polignac number, because 18880578513 - 2⁶ = 18880578449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18880578513.

It is not an unprimeable number, because it can be changed into a prime (18880578517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1048921020 + ... + 1048921037.

It is an arithmetic number, because the mean of its divisors is an integer number (4545324459).

Almost surely, 2^18880578513 is an apocalyptic number.

It is an amenable number.

18880578513 is a deficient number, since it is larger than the sum of its proper divisors (8391368241).

18880578513 is a wasteful number, since it uses less digits than its factorization.

18880578513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097842063 (or 2097842060 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 54.

The spelling of 18880578513 in words is "eighteen billion, eight hundred eighty million, five hundred seventy-eight thousand, five hundred thirteen".