166154561 has 8 divisors (see below), whose sum is σ = 169915200. Its totient is φ = 162425520.

The previous prime is 166154533. The next prime is 166154567. The reversal of 166154561 is 165451661.

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

It is a cyclic number.

It is not a de Polignac number, because 166154561 - 2¹⁸ = 165892417 is a prime.

It is a super-2 number, since 2×166154561² = 55214676282205442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166154567) 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 7 ways as a sum of consecutive naturals, for example, 2900 + ... + 18458.

It is an arithmetic number, because the mean of its divisors is an integer number (21239400).

Almost surely, 2^166154561 is an apocalyptic number.

It is an amenable number.

166154561 is a deficient number, since it is larger than the sum of its proper divisors (3760639).

166154561 is a wasteful number, since it uses less digits than its factorization.

166154561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15799.

The product of its digits is 21600, while the sum is 35.

The square root of 166154561 is about 12890.0954612447. The cubic root of 166154561 is about 549.7569846515.

The spelling of 166154561 in words is "one hundred sixty-six million, one hundred fifty-four thousand, five hundred sixty-one".