166481825897 has 4 divisors (see below), whose sum is σ = 175244027280. Its totient is φ = 157719624516.

The previous prime is 166481825891. The next prime is 166481825927. The reversal of 166481825897 is 798528184661.

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 a cyclic number.

It is not a de Polignac number, because 166481825897 - 2²⁰ = 166480777321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166481825891) 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, 4381100663 + ... + 4381100700.

It is an arithmetic number, because the mean of its divisors is an integer number (43811006820).

Almost surely, 2^166481825897 is an apocalyptic number.

It is an amenable number.

166481825897 is a deficient number, since it is larger than the sum of its proper divisors (8762201383).

166481825897 is an equidigital number, since it uses as much as digits as its factorization.

166481825897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8762201382.

The product of its digits is 46448640, while the sum is 65.

The spelling of 166481825897 in words is "one hundred sixty-six billion, four hundred eighty-one million, eight hundred twenty-five thousand, eight hundred ninety-seven".