18669377664 has 160 divisors (see below), whose sum is σ = 63497121600. Its totient is φ = 5334087168.

The previous prime is 18669377653. The next prime is 18669377669. The reversal of 18669377664 is 46677396681.

It is a super-2 number, since 2×18669377664² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (18669377669) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 56044 + ... + 201195.

It is an arithmetic number, because the mean of its divisors is an integer number (396857010).

Almost surely, 2^18669377664 is an apocalyptic number.

18669377664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18669377664 is an abundant number, since it is smaller than the sum of its proper divisors (44827743936).

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

18669377664 is an equidigital number, since it uses as much as digits as its factorization.

18669377664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257272 (or 257251 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 63.

The spelling of 18669377664 in words is "eighteen billion, six hundred sixty-nine million, three hundred seventy-seven thousand, six hundred sixty-four".