18366081840 has 60 divisors (see below), whose sum is σ = 61679427264. Its totient is φ = 4897621632.

The previous prime is 18366081829. The next prime is 18366081847. The reversal of 18366081840 is 4818066381.

It is a happy number.

18366081840 is a `hidden beast` number, since 1 + 8 + 36 + 608 + 1 + 8 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18366081847) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12753504 + ... + 12754943.

Almost surely, 2^18366081840 is an apocalyptic number.

18366081840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18366081840 is an abundant number, since it is smaller than the sum of its proper divisors (43313345424).

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

18366081840 is a wasteful number, since it uses less digits than its factorization.

18366081840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25508466 (or 25508457 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 45.

The spelling of 18366081840 in words is "eighteen billion, three hundred sixty-six million, eighty-one thousand, eight hundred forty".