166551157 has 4 divisors (see below), whose sum is σ = 167669100. Its totient is φ = 165433216.

The previous prime is 166551149. The next prime is 166551181. The reversal of 166551157 is 751155661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73119601 + 93431556 = 8551^2 + 9666^2 .

It is a cyclic number.

It is not a de Polignac number, because 166551157 - 2³ = 166551149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166551137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 558748 + ... + 559045.

It is an arithmetic number, because the mean of its divisors is an integer number (41917275).

Almost surely, 2^166551157 is an apocalyptic number.

It is an amenable number.

166551157 is a deficient number, since it is larger than the sum of its proper divisors (1117943).

166551157 is a wasteful number, since it uses less digits than its factorization.

166551157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1117942.

The product of its digits is 31500, while the sum is 37.

The square root of 166551157 is about 12905.4700418079. The cubic root of 166551157 is about 550.1940439286.

The spelling of 166551157 in words is "one hundred sixty-six million, five hundred fifty-one thousand, one hundred fifty-seven".