18390029255980 has 48 divisors (see below), whose sum is σ = 39003496118496. Its totient is φ = 7283144125440.

The previous prime is 18390029255963. The next prime is 18390029255981. The reversal of 18390029255980 is 8955292009381.

It is not an unprimeable number, because it can be changed into a prime (18390029255981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10367949 + ... + 12011428.

It is an arithmetic number, because the mean of its divisors is an integer number (812572835802).

Almost surely, 2^{18390029255980} is an apocalyptic number.

18390029255980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18390029255980 is an abundant number, since it is smaller than the sum of its proper divisors (20613466862516).

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

18390029255980 is a wasteful number, since it uses less digits than its factorization.

18390029255980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22379794 (or 22379792 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 61.

The spelling of 18390029255980 in words is "eighteen trillion, three hundred ninety billion, twenty-nine million, two hundred fifty-five thousand, nine hundred eighty".