166189953 has 4 divisors (see below), whose sum is σ = 221586608. Its totient is φ = 110793300.

The previous prime is 166189951. The next prime is 166189999. The reversal of 166189953 is 359981661.

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 166189953 - 2¹ = 166189951 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166189951) 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, 27698323 + ... + 27698328.

It is an arithmetic number, because the mean of its divisors is an integer number (55396652).

Almost surely, 2^166189953 is an apocalyptic number.

It is an amenable number.

166189953 is a deficient number, since it is larger than the sum of its proper divisors (55396655).

166189953 is an equidigital number, since it uses as much as digits as its factorization.

166189953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55396654.

The product of its digits is 349920, while the sum is 48.

The square root of 166189953 is about 12891.4682251480. The cubic root of 166189953 is about 549.7960158157.

The spelling of 166189953 in words is "one hundred sixty-six million, one hundred eighty-nine thousand, nine hundred fifty-three".