161665582 has 16 divisors (see below), whose sum is σ = 266081760. Its totient is φ = 73206432.

The previous prime is 161665579. The next prime is 161665601. The reversal of 161665582 is 285566161.

It is a super-2 number, since 2×161665582² = 52271520806797448, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 57282 + ... + 60037.

It is an arithmetic number, because the mean of its divisors is an integer number (16630110).

Almost surely, 2^161665582 is an apocalyptic number.

161665582 is a deficient number, since it is larger than the sum of its proper divisors (104416178).

161665582 is a wasteful number, since it uses less digits than its factorization.

161665582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117387.

The product of its digits is 86400, while the sum is 40.

The square root of 161665582 is about 12714.7780947998. The cubic root of 161665582 is about 544.7608096648.

The spelling of 161665582 in words is "one hundred sixty-one million, six hundred sixty-five thousand, five hundred eighty-two".