165647959 has 2 divisors, whose sum is σ = 165647960. Its totient is φ = 165647958.

The previous prime is 165647941. The next prime is 165648011. The reversal of 165647959 is 959746561.

It is an a-pointer prime, because the next prime (165648011) can be obtained adding 165647959 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165647959 - 2¹⁹ = 165123671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165647929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82823979 + 82823980.

It is an arithmetic number, because the mean of its divisors is an integer number (82823980).

Almost surely, 2^165647959 is an apocalyptic number.

165647959 is a deficient number, since it is larger than the sum of its proper divisors (1).

165647959 is an equidigital number, since it uses as much as digits as its factorization.

165647959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 165647959 is about 12870.4296354084. The cubic root of 165647959 is about 549.1976830754.

The spelling of 165647959 in words is "one hundred sixty-five million, six hundred forty-seven thousand, nine hundred fifty-nine".