18781625544 has 64 divisors (see below), whose sum is σ = 51403818240. Its totient is φ = 5671268160.

The previous prime is 18781625543. The next prime is 18781625567. The reversal of 18781625544 is 44552618781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18781625543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50982 + ... + 200405.

It is an arithmetic number, because the mean of its divisors is an integer number (803184660).

Almost surely, 2^18781625544 is an apocalyptic number.

It is an amenable number.

18781625544 is an abundant number, since it is smaller than the sum of its proper divisors (32622192696).

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

18781625544 is a wasteful number, since it uses less digits than its factorization.

18781625544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251690 (or 251686 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 51.

The spelling of 18781625544 in words is "eighteen billion, seven hundred eighty-one million, six hundred twenty-five thousand, five hundred forty-four".