18631219680 has 72 divisors (see below), whose sum is σ = 63579042072. Its totient is φ = 4968324864.

The previous prime is 18631219669. The next prime is 18631219699. The reversal of 18631219680 is 8691213681.

18631219680 is a `hidden beast` number, since 1 + 8 + 631 + 2 + 1 + 9 + 6 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6467734 + ... + 6470613.

It is an arithmetic number, because the mean of its divisors is an integer number (883042251).

Almost surely, 2^18631219680 is an apocalyptic number.

18631219680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18631219680 is an abundant number, since it is smaller than the sum of its proper divisors (44947822392).

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

18631219680 is a wasteful number, since it uses less digits than its factorization.

18631219680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12938368 (or 12938357 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 18631219680 in words is "eighteen billion, six hundred thirty-one million, two hundred nineteen thousand, six hundred eighty".