18811372780 has 24 divisors (see below), whose sum is σ = 41827641408. Its totient is φ = 7081928448.

The previous prime is 18811372759. The next prime is 18811372781. The reversal of 18811372780 is 8727311881.

It is a self number, because there is not a number n which added to its sum of digits gives 18811372780.

It is not an unprimeable number, because it can be changed into a prime (18811372781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27663444 + ... + 27664123.

It is an arithmetic number, because the mean of its divisors is an integer number (1742818392).

Almost surely, 2^18811372780 is an apocalyptic number.

18811372780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18811372780 is an abundant number, since it is smaller than the sum of its proper divisors (23016268628).

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

18811372780 is a wasteful number, since it uses less digits than its factorization.

18811372780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55327593 (or 55327591 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 46.

The spelling of 18811372780 in words is "eighteen billion, eight hundred eleven million, three hundred seventy-two thousand, seven hundred eighty".