170408661 has 4 divisors (see below), whose sum is σ = 227211552. Its totient is φ = 113605772.

The previous prime is 170408657. The next prime is 170408681. The reversal of 170408661 is 166804071.

It is a happy number.

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 170408661 - 2² = 170408657 is a prime.

It is a super-2 number, since 2×170408661² = 58078223487625842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170408681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28401441 + ... + 28401446.

It is an arithmetic number, because the mean of its divisors is an integer number (56802888).

Almost surely, 2^170408661 is an apocalyptic number.

It is an amenable number.

170408661 is a deficient number, since it is larger than the sum of its proper divisors (56802891).

170408661 is an equidigital number, since it uses as much as digits as its factorization.

170408661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56802890.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 170408661 is about 13054.0668375798. The cubic root of 170408661 is about 554.4093611056.

The spelling of 170408661 in words is "one hundred seventy million, four hundred eight thousand, six hundred sixty-one".