161668667 has 2 divisors, whose sum is σ = 161668668. Its totient is φ = 161668666.

The previous prime is 161668643. The next prime is 161668721. The reversal of 161668667 is 766866161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161668667 - 2¹⁰ = 161667643 is a prime.

It is a super-2 number, since 2×161668667² = 52273515779113778, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161668607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80834333 + 80834334.

It is an arithmetic number, because the mean of its divisors is an integer number (80834334).

Almost surely, 2^161668667 is an apocalyptic number.

161668667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161668667 is an equidigital number, since it uses as much as digits as its factorization.

161668667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 47.

The square root of 161668667 is about 12714.8994097476. The cubic root of 161668667 is about 544.7642747940.

The spelling of 161668667 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, six hundred sixty-seven".