18915461768 has 48 divisors (see below), whose sum is σ = 41558201820. Its totient is φ = 8047431168.

The previous prime is 18915461753. The next prime is 18915461779. The reversal of 18915461768 is 86716451981.

It can be written as a sum of positive squares in 2 ways, for example, as 18912300484 + 3161284 = 137522^2 + 1778^2 .

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122405 + ... + 229812.

Almost surely, 2^18915461768 is an apocalyptic number.

It is an amenable number.

18915461768 is an abundant number, since it is smaller than the sum of its proper divisors (22642740052).

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

18915461768 is a wasteful number, since it uses less digits than its factorization.

18915461768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352374 (or 352363 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 56.

The spelling of 18915461768 in words is "eighteen billion, nine hundred fifteen million, four hundred sixty-one thousand, seven hundred sixty-eight".