166590805001 has 2 divisors, whose sum is σ = 166590805002. Its totient is φ = 166590805000.

The previous prime is 166590804967. The next prime is 166590805009. The reversal of 166590805001 is 100508095661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166096187401 + 494617600 = 407549^2 + 22240^2 .

It is a cyclic number.

It is not a de Polignac number, because 166590805001 - 2⁶ = 166590804937 is a prime.

It is a super-2 number, since 2×166590805001² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166590805001.

It is not a weakly prime, because it can be changed into another prime (166590805009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83295402500 + 83295402501.

It is an arithmetic number, because the mean of its divisors is an integer number (83295402501).

Almost surely, 2^166590805001 is an apocalyptic number.

It is an amenable number.

166590805001 is a deficient number, since it is larger than the sum of its proper divisors (1).

166590805001 is an equidigital number, since it uses as much as digits as its factorization.

166590805001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 166590805001 in words is "one hundred sixty-six billion, five hundred ninety million, eight hundred five thousand, one".