166640900 has 18 divisors (see below), whose sum is σ = 361610970. Its totient is φ = 66656320.

The previous prime is 166640879. The next prime is 166640923. The reversal of 166640900 is 9046661.

It can be written as a sum of positive squares in 3 ways, for example, as 334084 + 166306816 = 578^2 + 12896^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 833105 + ... + 833304.

Almost surely, 2^166640900 is an apocalyptic number.

166640900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166640900 is an abundant number, since it is smaller than the sum of its proper divisors (194970070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166640900 is a wasteful number, since it uses less digits than its factorization.

166640900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666423 (or 1666416 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 166640900 is about 12908.9465100759. The cubic root of 166640900 is about 550.2928468012.

The spelling of 166640900 in words is "one hundred sixty-six million, six hundred forty thousand, nine hundred".