166405357 has 2 divisors, whose sum is σ = 166405358. Its totient is φ = 166405356.

The previous prime is 166405339. The next prime is 166405373. The reversal of 166405357 is 753504661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124077321 + 42328036 = 11139^2 + 6506^2 .

It is a cyclic number.

It is not a de Polignac number, because 166405357 - 2⁷ = 166405229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166405397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83202678 + 83202679.

It is an arithmetic number, because the mean of its divisors is an integer number (83202679).

Almost surely, 2^166405357 is an apocalyptic number.

It is an amenable number.

166405357 is a deficient number, since it is larger than the sum of its proper divisors (1).

166405357 is an equidigital number, since it uses as much as digits as its factorization.

166405357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 166405357 is about 12899.8200375044. The cubic root of 166405357 is about 550.0334492054.

The spelling of 166405357 in words is "one hundred sixty-six million, four hundred five thousand, three hundred fifty-seven".