161291667 has 32 divisors (see below), whose sum is σ = 231745536. Its totient is φ = 99590400.

The previous prime is 161291657. The next prime is 161291671. The reversal of 161291667 is 766192161.

It is not a de Polignac number, because 161291667 - 2¹⁵ = 161258899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161291657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 211567 + ... + 212327.

It is an arithmetic number, because the mean of its divisors is an integer number (7242048).

Almost surely, 2^161291667 is an apocalyptic number.

161291667 is a deficient number, since it is larger than the sum of its proper divisors (70453869).

161291667 is a wasteful number, since it uses less digits than its factorization.

161291667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 27216, while the sum is 39.

The square root of 161291667 is about 12700.0656297517. The cubic root of 161291667 is about 544.3404945125.

The spelling of 161291667 in words is "one hundred sixty-one million, two hundred ninety-one thousand, six hundred sixty-seven".