18566995456 has 160 divisors (see below), whose sum is σ = 40722536448. Its totient is φ = 8430428160.

The previous prime is 18566995441. The next prime is 18566995459. The reversal of 18566995456 is 65459966581.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18566995459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18735121 + ... + 18736111.

Almost surely, 2^18566995456 is an apocalyptic number.

18566995456 is a gapful number since it is divisible by the number (16) 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 18566995456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20361268224).

18566995456 is an abundant number, since it is smaller than the sum of its proper divisors (22155540992).

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

18566995456 is an equidigital number, since it uses as much as digits as its factorization.

18566995456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 1096 counting only the distinct ones).

The product of its digits is 69984000, while the sum is 64.

The spelling of 18566995456 in words is "eighteen billion, five hundred sixty-six million, nine hundred ninety-five thousand, four hundred fifty-six".