161775667 has 2 divisors, whose sum is σ = 161775668. Its totient is φ = 161775666.

The previous prime is 161775643. The next prime is 161775703. The reversal of 161775667 is 766577161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161775667 - 2²⁷ = 27557939 is a prime.

It is not a weakly prime, because it can be changed into another prime (161775617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80887833 + 80887834.

It is an arithmetic number, because the mean of its divisors is an integer number (80887834).

Almost surely, 2^161775667 is an apocalyptic number.

161775667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161775667 is an equidigital number, since it uses as much as digits as its factorization.

161775667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 370440, while the sum is 46.

The square root of 161775667 is about 12719.1063758426. The cubic root of 161775667 is about 544.8844319103.

It can be divided in two parts, 1617 and 75667, that added together give a square (77284 = 278²).

The spelling of 161775667 in words is "one hundred sixty-one million, seven hundred seventy-five thousand, six hundred sixty-seven".