166238667323 has 2 divisors, whose sum is σ = 166238667324. Its totient is φ = 166238667322.

The previous prime is 166238667319. The next prime is 166238667421. The reversal of 166238667323 is 323766832661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (323766832661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166238667323 - 2² = 166238667319 is a prime.

It is not a weakly prime, because it can be changed into another prime (166238667523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83119333661 + 83119333662.

It is an arithmetic number, because the mean of its divisors is an integer number (83119333662).

Almost surely, 2^166238667323 is an apocalyptic number.

166238667323 is a deficient number, since it is larger than the sum of its proper divisors (1).

166238667323 is an equidigital number, since it uses as much as digits as its factorization.

166238667323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7838208, while the sum is 53.

The spelling of 166238667323 in words is "one hundred sixty-six billion, two hundred thirty-eight million, six hundred sixty-seven thousand, three hundred twenty-three".