165731966 has 4 divisors (see below), whose sum is σ = 248597952. Its totient is φ = 82865982.

The previous prime is 165731939. The next prime is 165731971. The reversal of 165731966 is 669137561.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41432990 + ... + 41432993.

It is an arithmetic number, because the mean of its divisors is an integer number (62149488).

Almost surely, 2^165731966 is an apocalyptic number.

165731966 is a deficient number, since it is larger than the sum of its proper divisors (82865986).

165731966 is an equidigital number, since it uses as much as digits as its factorization.

165731966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82865985.

The product of its digits is 204120, while the sum is 44.

The square root of 165731966 is about 12873.6927880076. The cubic root of 165731966 is about 549.2905077481.

The spelling of 165731966 in words is "one hundred sixty-five million, seven hundred thirty-one thousand, nine hundred sixty-six".