166622279 has 2 divisors, whose sum is σ = 166622280. Its totient is φ = 166622278.

The previous prime is 166622273. The next prime is 166622333. The reversal of 166622279 is 972226661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166622279 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166622273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83311139 + 83311140.

It is an arithmetic number, because the mean of its divisors is an integer number (83311140).

Almost surely, 2^166622279 is an apocalyptic number.

166622279 is a deficient number, since it is larger than the sum of its proper divisors (1).

166622279 is an equidigital number, since it uses as much as digits as its factorization.

166622279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 166622279 is about 12908.2252459430. The cubic root of 166622279 is about 550.2723488627.

The spelling of 166622279 in words is "one hundred sixty-six million, six hundred twenty-two thousand, two hundred seventy-nine".