166561370 has 16 divisors (see below), whose sum is σ = 300096360. Its totient is φ = 66561024.

The previous prime is 166561327. The next prime is 166561411. The reversal of 166561370 is 73165661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 95277121 + 71284249 = 9761^2 + 8443^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166561370.

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, 3914 + ... + 18666.

Almost surely, 2^166561370 is an apocalyptic number.

166561370 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166561370 is a deficient number, since it is larger than the sum of its proper divisors (133534990).

166561370 is a wasteful number, since it uses less digits than its factorization.

166561370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15889.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 166561370 is about 12905.8657206714. The cubic root of 166561370 is about 550.2052897564.

The spelling of 166561370 in words is "one hundred sixty-six million, five hundred sixty-one thousand, three hundred seventy".