166312973 has 2 divisors, whose sum is σ = 166312974. Its totient is φ = 166312972.

The previous prime is 166312919. The next prime is 166312981. The reversal of 166312973 is 379213661.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106048804 + 60264169 = 10298^2 + 7763^2 .

It is a cyclic number.

It is not a de Polignac number, because 166312973 - 2²² = 162118669 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166312673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83156486 + 83156487.

It is an arithmetic number, because the mean of its divisors is an integer number (83156487).

Almost surely, 2^166312973 is an apocalyptic number.

It is an amenable number.

166312973 is a deficient number, since it is larger than the sum of its proper divisors (1).

166312973 is an equidigital number, since it uses as much as digits as its factorization.

166312973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 166312973 is about 12896.2387152224. The cubic root of 166312973 is about 549.9316421931.

The spelling of 166312973 in words is "one hundred sixty-six million, three hundred twelve thousand, nine hundred seventy-three".