166090690 has 8 divisors (see below), whose sum is σ = 298963260. Its totient is φ = 66436272.

The previous prime is 166090681. The next prime is 166090733. The reversal of 166090690 is 96090661.

It can be written as a sum of positive squares in 2 ways, for example, as 156275001 + 9815689 = 12501^2 + 3133^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×166090690² = 55172234609352200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8304525 + ... + 8304544.

Almost surely, 2^166090690 is an apocalyptic number.

166090690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166090690 is a deficient number, since it is larger than the sum of its proper divisors (132872570).

166090690 is a wasteful number, since it uses less digits than its factorization.

166090690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16609076.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 166090690 is about 12887.6177007234. The cubic root of 166090690 is about 549.6865321194.

The spelling of 166090690 in words is "one hundred sixty-six million, ninety thousand, six hundred ninety".