17918522985 has 32 divisors (see below), whose sum is σ = 32121274752. Its totient is φ = 8452961280.

The previous prime is 17918522933. The next prime is 17918522989. The reversal of 17918522985 is 58922581971.

It is not a de Polignac number, because 17918522985 - 2⁸ = 17918522729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17918522989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1461424 + ... + 1473633.

It is an arithmetic number, because the mean of its divisors is an integer number (1003789836).

Almost surely, 2^17918522985 is an apocalyptic number.

17918522985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17918522985 is a deficient number, since it is larger than the sum of its proper divisors (14202751767).

17918522985 is a wasteful number, since it uses less digits than its factorization.

17918522985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2935113.

The product of its digits is 3628800, while the sum is 57.

The spelling of 17918522985 in words is "seventeen billion, nine hundred eighteen million, five hundred twenty-two thousand, nine hundred eighty-five".