166323323693 has 2 divisors, whose sum is σ = 166323323694. Its totient is φ = 166323323692.

The previous prime is 166323323651. The next prime is 166323323701. The reversal of 166323323693 is 396323323661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98503705609 + 67819618084 = 313853^2 + 260422^2 .

It is a cyclic number.

It is not a de Polignac number, because 166323323693 - 2¹² = 166323319597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166323329693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83161661846 + 83161661847.

It is an arithmetic number, because the mean of its divisors is an integer number (83161661847).

Almost surely, 2^166323323693 is an apocalyptic number.

It is an amenable number.

166323323693 is a deficient number, since it is larger than the sum of its proper divisors (1).

166323323693 is an equidigital number, since it uses as much as digits as its factorization.

166323323693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1889568, while the sum is 47.

The spelling of 166323323693 in words is "one hundred sixty-six billion, three hundred twenty-three million, three hundred twenty-three thousand, six hundred ninety-three".