168117661 has 2 divisors, whose sum is σ = 168117662. Its totient is φ = 168117660.

The previous prime is 168117601. The next prime is 168117679. The reversal of 168117661 is 166711861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132940900 + 35176761 = 11530^2 + 5931^2 .

It is a cyclic number.

It is not a de Polignac number, because 168117661 - 2⁷ = 168117533 is a prime.

It is a super-2 number, since 2×168117661² = 56527095880221842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168117661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168117601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84058830 + 84058831.

It is an arithmetic number, because the mean of its divisors is an integer number (84058831).

Almost surely, 2^168117661 is an apocalyptic number.

It is an amenable number.

168117661 is a deficient number, since it is larger than the sum of its proper divisors (1).

168117661 is an equidigital number, since it uses as much as digits as its factorization.

168117661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 37.

The square root of 168117661 is about 12966.0194739943. The cubic root of 168117661 is about 551.9136217935.

The spelling of 168117661 in words is "one hundred sixty-eight million, one hundred seventeen thousand, six hundred sixty-one".