18656181840492 has 144 divisors (see below), whose sum is σ = 56447952865920. Its totient is φ = 5312974542624.

The previous prime is 18656181840479. The next prime is 18656181840497. The reversal of 18656181840492 is 29404818165681.

It is a happy number.

18656181840492 is a `hidden beast` number, since 1 + 8 + 6 + 5 + 61 + 8 + 1 + 84 + 0 + 492 = 666.

It is a Smith number, since the sum of its digits (63) 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 (63).

It is not an unprimeable number, because it can be changed into a prime (18656181840497) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4116978 + ... + 7366265.

It is an arithmetic number, because the mean of its divisors is an integer number (391999672680).

Almost surely, 2^{18656181840492} is an apocalyptic number.

18656181840492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18656181840492 is an abundant number, since it is smaller than the sum of its proper divisors (37791771025428).

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

18656181840492 is a wasteful number, since it uses less digits than its factorization.

18656181840492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11483577 (or 11483562 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 18656181840492 in words is "eighteen trillion, six hundred fifty-six billion, one hundred eighty-one million, eight hundred forty thousand, four hundred ninety-two".