166815361 has 16 divisors (see below), whose sum is σ = 177408000. Its totient is φ = 156654288.

The previous prime is 166815349. The next prime is 166815367. The reversal of 166815361 is 163518661.

It is a cyclic number.

It is not a de Polignac number, because 166815361 - 2⁵ = 166815329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166815361.

It is not an unprimeable number, because it can be changed into a prime (166815367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118540 + ... + 119938.

It is an arithmetic number, because the mean of its divisors is an integer number (11088000).

Almost surely, 2^166815361 is an apocalyptic number.

It is an amenable number.

166815361 is a deficient number, since it is larger than the sum of its proper divisors (10592639).

166815361 is a wasteful number, since it uses less digits than its factorization.

166815361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548.

The product of its digits is 25920, while the sum is 37.

The square root of 166815361 is about 12915.7021102223. The cubic root of 166815361 is about 550.4848187931.

The spelling of 166815361 in words is "one hundred sixty-six million, eight hundred fifteen thousand, three hundred sixty-one".