166617761 has 2 divisors, whose sum is σ = 166617762. Its totient is φ = 166617760.

The previous prime is 166617739. The next prime is 166617767. The reversal of 166617761 is 167716661.

166617761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159542161 + 7075600 = 12631^2 + 2660^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166617761 is a prime.

It is a super-2 number, since 2×166617761² = 55522956561306242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (166617767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83308880 + 83308881.

It is an arithmetic number, because the mean of its divisors is an integer number (83308881).

Almost surely, 2^166617761 is an apocalyptic number.

It is an amenable number.

166617761 is a deficient number, since it is larger than the sum of its proper divisors (1).

166617761 is an equidigital number, since it uses as much as digits as its factorization.

166617761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 41.

The square root of 166617761 is about 12908.0502400634. The cubic root of 166617761 is about 550.2673752322.

The spelling of 166617761 in words is "one hundred sixty-six million, six hundred seventeen thousand, seven hundred sixty-one".