166810557 has 16 divisors (see below), whose sum is σ = 238541760. Its totient is φ = 103364352.

The previous prime is 166810543. The next prime is 166810571. The reversal of 166810557 is 755018661.

It is an interprime number because it is at equal distance from previous prime (166810543) and next prime (166810571).

It is not a de Polignac number, because 166810557 - 2¹⁶ = 166745021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166810507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24588 + ... + 30629.

It is an arithmetic number, because the mean of its divisors is an integer number (14908860).

Almost surely, 2^166810557 is an apocalyptic number.

It is an amenable number.

166810557 is a deficient number, since it is larger than the sum of its proper divisors (71731203).

166810557 is a wasteful number, since it uses less digits than its factorization.

166810557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55292.

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 166810557 is about 12915.5161337052. The cubic root of 166810557 is about 550.4795343988.

The spelling of 166810557 in words is "one hundred sixty-six million, eight hundred ten thousand, five hundred fifty-seven".