166446537523 has 4 divisors (see below), whose sum is σ = 190224614320. Its totient is φ = 142668460728.

The previous prime is 166446537497. The next prime is 166446537581. The reversal of 166446537523 is 325735644661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 166446537523 - 2²⁵ = 166412983091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166446531523) 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, 11889038388 + ... + 11889038401.

It is an arithmetic number, because the mean of its divisors is an integer number (47556153580).

Almost surely, 2^166446537523 is an apocalyptic number.

166446537523 is a deficient number, since it is larger than the sum of its proper divisors (23778076797).

166446537523 is an equidigital number, since it uses as much as digits as its factorization.

166446537523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23778076796.

The product of its digits is 10886400, while the sum is 52.

The spelling of 166446537523 in words is "one hundred sixty-six billion, four hundred forty-six million, five hundred thirty-seven thousand, five hundred twenty-three".