18317533980 has 48 divisors (see below), whose sum is σ = 51658104960. Its totient is φ = 4849531968.

The previous prime is 18317533957. The next prime is 18317533981. The reversal of 18317533980 is 8933571381.

It is a super-2 number, since 2×18317533980² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18317533981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1089834 + ... + 1106513.

It is an arithmetic number, because the mean of its divisors is an integer number (1076210520).

Almost surely, 2^18317533980 is an apocalyptic number.

18317533980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18317533980 is an abundant number, since it is smaller than the sum of its proper divisors (33340570980).

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

18317533980 is a wasteful number, since it uses less digits than its factorization.

18317533980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196498 (or 2196496 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 18317533980 in words is "eighteen billion, three hundred seventeen million, five hundred thirty-three thousand, nine hundred eighty".