161615667 has 16 divisors (see below), whose sum is σ = 224439552. Its totient is φ = 103350240.

The previous prime is 161615647. The next prime is 161615669. The reversal of 161615667 is 766516161.

It is not a de Polignac number, because 161615667 - 2¹⁰ = 161614643 is a prime.

It is a super-2 number, since 2×161615667² = 52239247639709778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161615669) 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 in 15 ways as a sum of consecutive naturals, for example, 2373 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (14027472).

Almost surely, 2^161615667 is an apocalyptic number.

161615667 is a deficient number, since it is larger than the sum of its proper divisors (62823885).

161615667 is a wasteful number, since it uses less digits than its factorization.

161615667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20618.

The product of its digits is 45360, while the sum is 39.

The square root of 161615667 is about 12712.8150698419. The cubic root of 161615667 is about 544.7047380828.

The spelling of 161615667 in words is "one hundred sixty-one million, six hundred fifteen thousand, six hundred sixty-seven".