166917188026 has 24 divisors (see below), whose sum is σ = 253318665852. Its totient is φ = 82488720000.

The previous prime is 166917187949. The next prime is 166917188027. The reversal of 166917188026 is 620881719661.

166917188026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 408555²+1.

It can be written as a sum of positive squares in 6 ways, for example, as 141763545225 + 25153642801 = 376515^2 + 158599^2 .

It is a super-2 number, since 2×166917188026² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (166917188027) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 12254796 + ... + 12268408.

Almost surely, 2^166917188026 is an apocalyptic number.

166917188026 is a deficient number, since it is larger than the sum of its proper divisors (86401477826).

166917188026 is a wasteful number, since it uses less digits than its factorization.

166917188026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14418 (or 14317 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 55.

The spelling of 166917188026 in words is "one hundred sixty-six billion, nine hundred seventeen million, one hundred eighty-eight thousand, twenty-six".