18021985610 has 32 divisors (see below), whose sum is σ = 32525841600. Its totient is φ = 7189655040.

The previous prime is 18021985559. The next prime is 18021985633. The reversal of 18021985610 is 1658912081.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9539546 + ... + 9541434.

It is an arithmetic number, because the mean of its divisors is an integer number (1016432550).

Almost surely, 2^18021985610 is an apocalyptic number.

18021985610 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18021985610 is a deficient number, since it is larger than the sum of its proper divisors (14503855990).

18021985610 is a wasteful number, since it uses less digits than its factorization.

18021985610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926.

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 18021985610 in words is "eighteen billion, twenty-one million, nine hundred eighty-five thousand, six hundred ten".