18636715440 has 640 divisors, whose sum is σ = 79923456000. Its totient is φ = 3894718464.

The previous prime is 18636715417. The next prime is 18636715451. The reversal of 18636715440 is 4451763681.

18636715440 is a `hidden beast` number, since 1 + 8 + 6 + 36 + 71 + 544 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8330002 + ... + 8332238.

It is an arithmetic number, because the mean of its divisors is an integer number (124880400).

Almost surely, 2^18636715440 is an apocalyptic number.

18636715440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18636715440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39961728000).

18636715440 is an abundant number, since it is smaller than the sum of its proper divisors (61286740560).

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

18636715440 is a wasteful number, since it uses less digits than its factorization.

18636715440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314 (or 2302 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 18636715440 in words is "eighteen billion, six hundred thirty-six million, seven hundred fifteen thousand, four hundred forty".