166570401 has 4 divisors (see below), whose sum is σ = 222093872. Its totient is φ = 111046932.

The previous prime is 166570381. The next prime is 166570429. The reversal of 166570401 is 104075661.

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 not a de Polignac number, because 166570401 - 2⁹ = 166569889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166570441) 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, 27761731 + ... + 27761736.

It is an arithmetic number, because the mean of its divisors is an integer number (55523468).

Almost surely, 2^166570401 is an apocalyptic number.

It is an amenable number.

166570401 is a deficient number, since it is larger than the sum of its proper divisors (55523471).

166570401 is an equidigital number, since it uses as much as digits as its factorization.

166570401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55523470.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 166570401 is about 12906.2155955958. The cubic root of 166570401 is about 550.2152336671.

The spelling of 166570401 in words is "one hundred sixty-six million, five hundred seventy thousand, four hundred one".