165631633 has 2 divisors, whose sum is σ = 165631634. Its totient is φ = 165631632.

The previous prime is 165631621. The next prime is 165631651. The reversal of 165631633 is 336136561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133448704 + 32182929 = 11552^2 + 5673^2 .

It is a cyclic number.

It is not a de Polignac number, because 165631633 - 2⁵ = 165631601 is a prime.

It is not a weakly prime, because it can be changed into another prime (165631033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82815816 + 82815817.

It is an arithmetic number, because the mean of its divisors is an integer number (82815817).

Almost surely, 2^165631633 is an apocalyptic number.

It is an amenable number.

165631633 is a deficient number, since it is larger than the sum of its proper divisors (1).

165631633 is an equidigital number, since it uses as much as digits as its factorization.

165631633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 34.

The square root of 165631633 is about 12869.7953752187. The cubic root of 165631633 is about 549.1796397985.

The spelling of 165631633 in words is "one hundred sixty-five million, six hundred thirty-one thousand, six hundred thirty-three".