17986202645 has 18 divisors (see below), whose sum is σ = 22196238246. Its totient is φ = 13991434560.

The previous prime is 17986202609. The next prime is 17986202677. The reversal of 17986202645 is 54620268971.

It can be written as a sum of positive squares in 9 ways, for example, as 1324814404 + 16661388241 = 36398^2 + 129079^2 .

It is not a de Polignac number, because 17986202645 - 2¹⁶ = 17986137109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17986202593 and 17986202602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 11094935 + ... + 11096555.

It is an arithmetic number, because the mean of its divisors is an integer number (1233124347).

Almost surely, 2^17986202645 is an apocalyptic number.

It is an amenable number.

17986202645 is a deficient number, since it is larger than the sum of its proper divisors (4210035601).

17986202645 is an frugal number, since it uses more digits than its factorization.

17986202645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3321 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 17986202645 in words is "seventeen billion, nine hundred eighty-six million, two hundred two thousand, six hundred forty-five".