165799967 has 2 divisors, whose sum is σ = 165799968. Its totient is φ = 165799966.

The previous prime is 165799961. The next prime is 165800017. The reversal of 165799967 is 769997561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165799967 - 2⁶ = 165799903 is a prime.

It is a super-3 number, since 3×165799967³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165799961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82899983 + 82899984.

It is an arithmetic number, because the mean of its divisors is an integer number (82899984).

Almost surely, 2^165799967 is an apocalyptic number.

165799967 is a deficient number, since it is larger than the sum of its proper divisors (1).

165799967 is an equidigital number, since it uses as much as digits as its factorization.

165799967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6429780, while the sum is 59.

The square root of 165799967 is about 12876.3336008353. Note that the first 3 decimals coincide. The cubic root of 165799967 is about 549.3656234047.

The spelling of 165799967 in words is "one hundred sixty-five million, seven hundred ninety-nine thousand, nine hundred sixty-seven".