18811577922540 has 48 divisors (see below), whose sum is σ = 56724142661088. Its totient is φ = 4630542257664.

The previous prime is 18811577922499. The next prime is 18811577922569. The reversal of 18811577922540 is 4522977511881.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12058703017 + ... + 12058704576.

It is an arithmetic number, because the mean of its divisors is an integer number (1181752972106).

Almost surely, 2^{18811577922540} is an apocalyptic number.

18811577922540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18811577922540 is an abundant number, since it is smaller than the sum of its proper divisors (37912564738548).

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

18811577922540 is a wasteful number, since it uses less digits than its factorization.

18811577922540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24117407618 (or 24117407616 counting only the distinct ones).

The product of its (nonzero) digits is 11289600, while the sum is 60.

The spelling of 18811577922540 in words is "eighteen trillion, eight hundred eleven billion, five hundred seventy-seven million, nine hundred twenty-two thousand, five hundred forty".