166604401 has 2 divisors, whose sum is σ = 166604402. Its totient is φ = 166604400.

The previous prime is 166604393. The next prime is 166604423. The reversal of 166604401 is 104406661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89586225 + 77018176 = 9465^2 + 8776^2 .

It is a cyclic number.

It is not a de Polignac number, because 166604401 - 2³ = 166604393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166604401.

It is not a weakly prime, because it can be changed into another prime (166604701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83302200 + 83302201.

It is an arithmetic number, because the mean of its divisors is an integer number (83302201).

Almost surely, 2^166604401 is an apocalyptic number.

It is an amenable number.

166604401 is a deficient number, since it is larger than the sum of its proper divisors (1).

166604401 is an equidigital number, since it uses as much as digits as its factorization.

166604401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 166604401 is about 12907.5327231815. The cubic root of 166604401 is about 550.2526673791.

The spelling of 166604401 in words is "one hundred sixty-six million, six hundred four thousand, four hundred one".