166523026433969 has 2 divisors, whose sum is σ = 166523026433970. Its totient is φ = 166523026433968.

The previous prime is 166523026433893. The next prime is 166523026434053. The reversal of 166523026433969 is 969334620325661.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99146230128400 + 67376796305569 = 9957220^2 + 8208337^2 .

It is a cyclic number.

It is not a de Polignac number, because 166523026433969 - 2¹² = 166523026429873 is a prime.

It is a super-2 number, since 2×166523026433969² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (166523026403969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83261513216984 + 83261513216985.

It is an arithmetic number, because the mean of its divisors is an integer number (83261513216985).

Almost surely, 2^{166523026433969} is an apocalyptic number.

It is an amenable number.

166523026433969 is a deficient number, since it is larger than the sum of its proper divisors (1).

166523026433969 is an equidigital number, since it uses as much as digits as its factorization.

166523026433969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226748160, while the sum is 65.

The spelling of 166523026433969 in words is "one hundred sixty-six trillion, five hundred twenty-three billion, twenty-six million, four hundred thirty-three thousand, nine hundred sixty-nine".