166445157 has 4 divisors (see below), whose sum is σ = 221926880. Its totient is φ = 110963436.

The previous prime is 166445101. The next prime is 166445161. The reversal of 166445157 is 751544661.

166445157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 166445157 - 2⁶ = 166445093 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 (166445177) 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, 27740857 + ... + 27740862.

It is an arithmetic number, because the mean of its divisors is an integer number (55481720).

Almost surely, 2^166445157 is an apocalyptic number.

It is an amenable number.

166445157 is a deficient number, since it is larger than the sum of its proper divisors (55481723).

166445157 is an equidigital number, since it uses as much as digits as its factorization.

166445157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55481722.

The product of its digits is 100800, while the sum is 39.

The square root of 166445157 is about 12901.3626024541. The cubic root of 166445157 is about 550.0772971251.

The spelling of 166445157 in words is "one hundred sixty-six million, four hundred forty-five thousand, one hundred fifty-seven".