166256173 has 2 divisors, whose sum is σ = 166256174. Its totient is φ = 166256172.

The previous prime is 166256119. The next prime is 166256219. The reversal of 166256173 is 371652661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165945924 + 310249 = 12882^2 + 557^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166256173 is a prime.

It is a super-2 number, since 2×166256173² = 55282230121211858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166256473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83128086 + 83128087.

It is an arithmetic number, because the mean of its divisors is an integer number (83128087).

Almost surely, 2^166256173 is an apocalyptic number.

It is an amenable number.

166256173 is a deficient number, since it is larger than the sum of its proper divisors (1).

166256173 is an equidigital number, since it uses as much as digits as its factorization.

166256173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 37.

The square root of 166256173 is about 12894.0363346781. The cubic root of 166256173 is about 549.8690299720.

The spelling of 166256173 in words is "one hundred sixty-six million, two hundred fifty-six thousand, one hundred seventy-three".