166530394801 has 2 divisors, whose sum is σ = 166530394802. Its totient is φ = 166530394800.

The previous prime is 166530394769. The next prime is 166530394829. The reversal of 166530394801 is 108493035661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98630543025 + 67899851776 = 314055^2 + 260576^2 .

It is a cyclic number.

It is not a de Polignac number, because 166530394801 - 2⁵ = 166530394769 is a prime.

It is not a weakly prime, because it can be changed into another prime (166530394301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83265197400 + 83265197401.

It is an arithmetic number, because the mean of its divisors is an integer number (83265197401).

Almost surely, 2^166530394801 is an apocalyptic number.

It is an amenable number.

166530394801 is a deficient number, since it is larger than the sum of its proper divisors (1).

166530394801 is an equidigital number, since it uses as much as digits as its factorization.

166530394801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 166530394801 in words is "one hundred sixty-six billion, five hundred thirty million, three hundred ninety-four thousand, eight hundred one".