18775234636440 has 128 divisors (see below), whose sum is σ = 56512560772800. Its totient is φ = 4990141071360.

The previous prime is 18775234636439. The next prime is 18775234636451. The reversal of 18775234636440 is 4463643257781.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 56423350 + ... + 56755130.

Almost surely, 2^{18775234636440} is an apocalyptic number.

18775234636440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18775234636440 is an abundant number, since it is smaller than the sum of its proper divisors (37737326136360).

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

18775234636440 is a wasteful number, since it uses less digits than its factorization.

18775234636440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333357 (or 333353 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 60.

The spelling of 18775234636440 in words is "eighteen trillion, seven hundred seventy-five billion, two hundred thirty-four million, six hundred thirty-six thousand, four hundred forty".