167868661 has 2 divisors, whose sum is σ = 167868662. Its totient is φ = 167868660.

The previous prime is 167868607. The next prime is 167868677. The reversal of 167868661 is 166868761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161442436 + 6426225 = 12706^2 + 2535^2 .

It is a cyclic number.

It is not a de Polignac number, because 167868661 - 2²¹ = 165771509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167868691) 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, 83934330 + 83934331.

It is an arithmetic number, because the mean of its divisors is an integer number (83934331).

Almost surely, 2^167868661 is an apocalyptic number.

It is an amenable number.

167868661 is a deficient number, since it is larger than the sum of its proper divisors (1).

167868661 is an equidigital number, since it uses as much as digits as its factorization.

167868661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 49.

The square root of 167868661 is about 12956.4138942842. The cubic root of 167868661 is about 551.6410063832.

The spelling of 167868661 in words is "one hundred sixty-seven million, eight hundred sixty-eight thousand, six hundred sixty-one".