18761138256 has 160 divisors (see below), whose sum is σ = 58831377408. Its totient is φ = 5029263360.

The previous prime is 18761138243. The next prime is 18761138261. The reversal of 18761138256 is 65283116781.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1885711 + ... + 1895633.

Almost surely, 2^18761138256 is an apocalyptic number.

18761138256 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 18761138256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29415688704).

18761138256 is an abundant number, since it is smaller than the sum of its proper divisors (40070239152).

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

18761138256 is a wasteful number, since it uses less digits than its factorization.

18761138256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10289 (or 10283 counting only the distinct ones).

The product of its digits is 483840, while the sum is 48.

The spelling of 18761138256 in words is "eighteen billion, seven hundred sixty-one million, one hundred thirty-eight thousand, two hundred fifty-six".