18378938246 has 16 divisors (see below), whose sum is σ = 27851641344. Its totient is φ = 9095215944.

The previous prime is 18378938177. The next prime is 18378938261. The reversal of 18378938246 is 64283987381.

It is a happy number.

It is a congruent number.

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, 197111 + ... + 274973.

It is an arithmetic number, because the mean of its divisors is an integer number (1740727584).

Almost surely, 2^18378938246 is an apocalyptic number.

18378938246 is a deficient number, since it is larger than the sum of its proper divisors (9472703098).

18378938246 is a wasteful number, since it uses less digits than its factorization.

18378938246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79075.

The product of its digits is 13934592, while the sum is 59.

The spelling of 18378938246 in words is "eighteen billion, three hundred seventy-eight million, nine hundred thirty-eight thousand, two hundred forty-six".