166610409 has 8 divisors (see below), whose sum is σ = 253882560. Its totient is φ = 95205936.

The previous prime is 166610407. The next prime is 166610417. The reversal of 166610409 is 904016661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166610409 - 2¹ = 166610407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166610409.

It is not an unprimeable number, because it can be changed into a prime (166610407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3966894 + ... + 3966935.

It is an arithmetic number, because the mean of its divisors is an integer number (31735320).

Almost surely, 2^166610409 is an apocalyptic number.

It is an amenable number.

166610409 is a deficient number, since it is larger than the sum of its proper divisors (87272151).

166610409 is an equidigital number, since it uses as much as digits as its factorization.

166610409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7933839.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 166610409 is about 12907.7654534005. The cubic root of 166610409 is about 550.2592816067.

The spelling of 166610409 in words is "one hundred sixty-six million, six hundred ten thousand, four hundred nine".