18154966849 has 4 divisors (see below), whose sum is σ = 19110491440. Its totient is φ = 17199442260.

The previous prime is 18154966733. The next prime is 18154966871. The reversal of 18154966849 is 94866945181.

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.

It is a cyclic number.

It is not a de Polignac number, because 18154966849 - 2²¹ = 18152869697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18154966549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477762267 + ... + 477762304.

It is an arithmetic number, because the mean of its divisors is an integer number (4777622860).

Almost surely, 2^18154966849 is an apocalyptic number.

18154966849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18154966849 is a deficient number, since it is larger than the sum of its proper divisors (955524591).

18154966849 is an equidigital number, since it uses as much as digits as its factorization.

18154966849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955524590.

The product of its digits is 14929920, while the sum is 61.

The spelling of 18154966849 in words is "eighteen billion, one hundred fifty-four million, nine hundred sixty-six thousand, eight hundred forty-nine".