15321809980 has 48 divisors (see below), whose sum is σ = 34239844800. Its totient is φ = 5739199488.

The previous prime is 15321809959. The next prime is 15321809983. The reversal of 15321809980 is 8990812351.

It is a super-2 number, since 2×15321809980² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15321809980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15321809983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45567 + ... + 180886.

It is an arithmetic number, because the mean of its divisors is an integer number (713330100).

Almost surely, 2^15321809980 is an apocalyptic number.

15321809980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15321809980 is an abundant number, since it is smaller than the sum of its proper divisors (18918034820).

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

15321809980 is a wasteful number, since it uses less digits than its factorization.

15321809980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226678 (or 226676 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 46.

The spelling of 15321809980 in words is "fifteen billion, three hundred twenty-one million, eight hundred nine thousand, nine hundred eighty".