166412765 has 4 divisors (see below), whose sum is σ = 199695324. Its totient is φ = 133130208.

The previous prime is 166412747. The next prime is 166412767. The reversal of 166412765 is 567214661.

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

It can be written as a sum of positive squares in 2 ways, for example, as 121066009 + 45346756 = 11003^2 + 6734^2 .

It is a cyclic number.

It is not a de Polignac number, because 166412765 - 2²² = 162218461 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 (166412767) 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, 16641272 + ... + 16641281.

It is an arithmetic number, because the mean of its divisors is an integer number (49923831).

Almost surely, 2^166412765 is an apocalyptic number.

It is an amenable number.

166412765 is a deficient number, since it is larger than the sum of its proper divisors (33282559).

166412765 is an equidigital number, since it uses as much as digits as its factorization.

166412765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33282558.

The product of its digits is 60480, while the sum is 38.

The square root of 166412765 is about 12900.1071700975. The cubic root of 166412765 is about 550.0416111768.

The spelling of 166412765 in words is "one hundred sixty-six million, four hundred twelve thousand, seven hundred sixty-five".