18187420153 has 4 divisors (see below), whose sum is σ = 20785623040. Its totient is φ = 15589217268.

The previous prime is 18187420087. The next prime is 18187420157. The reversal of 18187420153 is 35102478181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35102478181 = 52127 ⋅673403.

It is a cyclic number.

It is not a de Polignac number, because 18187420153 - 2²¹ = 18185323001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18187420157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299101433 + ... + 1299101446.

It is an arithmetic number, because the mean of its divisors is an integer number (5196405760).

Almost surely, 2^18187420153 is an apocalyptic number.

It is an amenable number.

18187420153 is a deficient number, since it is larger than the sum of its proper divisors (2598202887).

18187420153 is an equidigital number, since it uses as much as digits as its factorization.

18187420153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598202886.

The product of its (nonzero) digits is 53760, while the sum is 40.

The spelling of 18187420153 in words is "eighteen billion, one hundred eighty-seven million, four hundred twenty thousand, one hundred fifty-three".