17666131396 has 9 divisors (see below), whose sum is σ = 30916195149. Its totient is φ = 8832932784.

The previous prime is 17666131393. The next prime is 17666131397. The reversal of 17666131396 is 69313166671.

The square root of 17666131396 is 132914.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3472744900 + 14193386496 = 58930^2 + 119136^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17666131393) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 232600 + ... + 299056.

Almost surely, 2^17666131396 is an apocalyptic number.

17666131396 is the 132914-th square number.

It is an amenable number.

17666131396 is a deficient number, since it is larger than the sum of its proper divisors (13250063753).

17666131396 is an frugal number, since it uses more digits than its factorization.

17666131396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132918 (or 66459 counting only the distinct ones).

The product of its digits is 734832, while the sum is 49.

Multiplying 17666131396 by its sum of digits (49), we get a square (865640438404 = 930398²).

The spelling of 17666131396 in words is "seventeen billion, six hundred sixty-six million, one hundred thirty-one thousand, three hundred ninety-six".