165515983 has 2 divisors, whose sum is σ = 165515984. Its totient is φ = 165515982.

The previous prime is 165515971. The next prime is 165515989. The reversal of 165515983 is 389515561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165515983 - 2⁵ = 165515951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165515989) by changing a digit.

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, 82757991 + 82757992.

It is an arithmetic number, because the mean of its divisors is an integer number (82757992).

Almost surely, 2^165515983 is an apocalyptic number.

165515983 is a deficient number, since it is larger than the sum of its proper divisors (1).

165515983 is an equidigital number, since it uses as much as digits as its factorization.

165515983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162000, while the sum is 43.

The square root of 165515983 is about 12865.3015122072. The cubic root of 165515983 is about 549.0517910050.

The spelling of 165515983 in words is "one hundred sixty-five million, five hundred fifteen thousand, nine hundred eighty-three".