166478761 has 4 divisors (see below), whose sum is σ = 173716992. Its totient is φ = 159240532.

The previous prime is 166478723. The next prime is 166478783. The reversal of 166478761 is 167874661.

166478761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 166478761 - 2⁷ = 166478633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166478261) 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, 3619081 + ... + 3619126.

It is an arithmetic number, because the mean of its divisors is an integer number (43429248).

Almost surely, 2^166478761 is an apocalyptic number.

It is an amenable number.

166478761 is a deficient number, since it is larger than the sum of its proper divisors (7238231).

166478761 is an equidigital number, since it uses as much as digits as its factorization.

166478761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7238230.

The product of its digits is 338688, while the sum is 46.

The square root of 166478761 is about 12902.6648797836. The cubic root of 166478761 is about 550.1143134292.

The spelling of 166478761 in words is "one hundred sixty-six million, four hundred seventy-eight thousand, seven hundred sixty-one".