18912121161575 has 6 divisors (see below), whose sum is σ = 23451030240384. Its totient is φ = 15129696929240.

The previous prime is 18912121161559. The next prime is 18912121161587. The reversal of 18912121161575 is 57516112121981.

It is not a de Polignac number, because 18912121161575 - 2⁴ = 18912121161559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 378242423207 + ... + 378242423256.

It is an arithmetic number, because the mean of its divisors is an integer number (3908505040064).

Almost surely, 2^{18912121161575} is an apocalyptic number.

18912121161575 is a deficient number, since it is larger than the sum of its proper divisors (4538909078809).

18912121161575 is an equidigital number, since it uses as much as digits as its factorization.

18912121161575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756484846473 (or 756484846468 counting only the distinct ones).

The product of its digits is 302400, while the sum is 50.

The spelling of 18912121161575 in words is "eighteen trillion, nine hundred twelve billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred seventy-five".