18639878970 has 16 divisors (see below), whose sum is σ = 44735709600. Its totient is φ = 4970634384.

The previous prime is 18639878903. The next prime is 18639879001. The reversal of 18639878970 is 7987893681.

It is an unprimeable number.

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, 310664620 + ... + 310664679.

It is an arithmetic number, because the mean of its divisors is an integer number (2795981850).

Almost surely, 2^18639878970 is an apocalyptic number.

18639878970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18639878970 is an abundant number, since it is smaller than the sum of its proper divisors (26095830630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18639878970 is a wasteful number, since it uses less digits than its factorization.

18639878970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621329309.

The product of its (nonzero) digits is 36578304, while the sum is 66.

The spelling of 18639878970 in words is "eighteen billion, six hundred thirty-nine million, eight hundred seventy-eight thousand, nine hundred seventy".