166661930 has 16 divisors (see below), whose sum is σ = 301163400. Its totient is φ = 66404352.

The previous prime is 166661899. The next prime is 166661941. The reversal of 166661930 is 39166661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 162129289 + 4532641 = 12733^2 + 2129^2 .

It is a super-2 number, since 2×166661930² = 55552397822649800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29855 + ... + 34994.

Almost surely, 2^166661930 is an apocalyptic number.

166661930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166661930 is a deficient number, since it is larger than the sum of its proper divisors (134501470).

166661930 is a wasteful number, since it uses less digits than its factorization.

166661930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65113.

The product of its (nonzero) digits is 34992, while the sum is 38.

The square root of 166661930 is about 12909.7610357435. The cubic root of 166661930 is about 550.3159947235.

The spelling of 166661930 in words is "one hundred sixty-six million, six hundred sixty-one thousand, nine hundred thirty".