166053891 has 16 divisors (see below), whose sum is σ = 227766528. Its totient is φ = 107532000.

The previous prime is 166053889. The next prime is 166053893. The reversal of 166053891 is 198350661.

It is an interprime number because it is at equal distance from previous prime (166053889) and next prime (166053893).

It is not a de Polignac number, because 166053891 - 2¹ = 166053889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166053893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113716 + ... + 115166.

It is an arithmetic number, because the mean of its divisors is an integer number (14235408).

Almost surely, 2^166053891 is an apocalyptic number.

166053891 is a deficient number, since it is larger than the sum of its proper divisors (61712637).

166053891 is a wasteful number, since it uses less digits than its factorization.

166053891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2522.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 166053891 is about 12886.1899334132. The cubic root of 166053891 is about 549.6459329969.

The spelling of 166053891 in words is "one hundred sixty-six million, fifty-three thousand, eight hundred ninety-one".