18251649242 has 16 divisors (see below), whose sum is σ = 30513594240. Its totient is φ = 8136957888.

The previous prime is 18251649239. The next prime is 18251649263. The reversal of 18251649242 is 24294615281.

It is a junction number, because it is equal to n+sod(n) for n = 18251649193 and 18251649202.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 14126018 + ... + 14127309.

It is an arithmetic number, because the mean of its divisors is an integer number (1907099640).

Almost surely, 2^18251649242 is an apocalyptic number.

18251649242 is a deficient number, since it is larger than the sum of its proper divisors (12261944998).

18251649242 is a wasteful number, since it uses less digits than its factorization.

18251649242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28253365.

The product of its digits is 276480, while the sum is 44.

The spelling of 18251649242 in words is "eighteen billion, two hundred fifty-one million, six hundred forty-nine thousand, two hundred forty-two".