166583433197 has 2 divisors, whose sum is σ = 166583433198. Its totient is φ = 166583433196.

The previous prime is 166583433179. The next prime is 166583433199. The reversal of 166583433197 is 791334385661.

Together with previous prime (166583433179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127082268196 + 39501165001 = 356486^2 + 198749^2 .

It is a cyclic number.

It is not a de Polignac number, because 166583433197 - 2¹⁶ = 166583367661 is a prime.

Together with 166583433199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166583433199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83291716598 + 83291716599.

It is an arithmetic number, because the mean of its divisors is an integer number (83291716599).

Almost surely, 2^166583433197 is an apocalyptic number.

It is an amenable number.

166583433197 is a deficient number, since it is larger than the sum of its proper divisors (1).

166583433197 is an equidigital number, since it uses as much as digits as its factorization.

166583433197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9797760, while the sum is 56.

The spelling of 166583433197 in words is "one hundred sixty-six billion, five hundred eighty-three million, four hundred thirty-three thousand, one hundred ninety-seven".