168861617 has 2 divisors, whose sum is σ = 168861618. Its totient is φ = 168861616.

The previous prime is 168861587. The next prime is 168861661. The reversal of 168861617 is 716168861.

It is an a-pointer prime, because the next prime (168861661) can be obtained adding 168861617 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150577441 + 18284176 = 12271^2 + 4276^2 .

It is a cyclic number.

It is not a de Polignac number, because 168861617 - 2²² = 164667313 is a prime.

It is not a weakly prime, because it can be changed into another prime (168861677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84430808 + 84430809.

It is an arithmetic number, because the mean of its divisors is an integer number (84430809).

Almost surely, 2^168861617 is an apocalyptic number.

It is an amenable number.

168861617 is a deficient number, since it is larger than the sum of its proper divisors (1).

168861617 is an equidigital number, since it uses as much as digits as its factorization.

168861617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 44.

The square root of 168861617 is about 12994.6764869311. The cubic root of 168861617 is about 552.7265351417.

The spelling of 168861617 in words is "one hundred sixty-eight million, eight hundred sixty-one thousand, six hundred seventeen".