18198542642 has 16 divisors (see below), whose sum is σ = 31636904832. Its totient is φ = 7689524640.

The previous prime is 18198542641. The next prime is 18198542671. The reversal of 18198542642 is 24624589181.

It is not an unprimeable number, because it can be changed into a prime (18198542641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9153203 + ... + 9155190.

It is an arithmetic number, because the mean of its divisors is an integer number (1977306552).

Almost surely, 2^18198542642 is an apocalyptic number.

18198542642 is a deficient number, since it is larger than the sum of its proper divisors (13438362190).

18198542642 is a wasteful number, since it uses less digits than its factorization.

18198542642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18308473.

The product of its digits is 1105920, while the sum is 50.

The spelling of 18198542642 in words is "eighteen billion, one hundred ninety-eight million, five hundred forty-two thousand, six hundred forty-two".