18390915174772 has 48 divisors (see below), whose sum is σ = 37501517531520. Its totient is φ = 7727806000512.

The previous prime is 18390915174733. The next prime is 18390915174811. The reversal of 18390915174772 is 27747151909381.

It is an interprime number because it is at equal distance from previous prime (18390915174733) and next prime (18390915174811).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2081863 + ... + 6412174.

It is an arithmetic number, because the mean of its divisors is an integer number (781281615240).

Almost surely, 2^{18390915174772} is an apocalyptic number.

It is an amenable number.

18390915174772 is an abundant number, since it is smaller than the sum of its proper divisors (19110602356748).

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

18390915174772 is a wasteful number, since it uses less digits than its factorization.

18390915174772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495560 (or 8495558 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 18390915174772 in words is "eighteen trillion, three hundred ninety billion, nine hundred fifteen million, one hundred seventy-four thousand, seven hundred seventy-two".