165506633 has 2 divisors, whose sum is σ = 165506634. Its totient is φ = 165506632.

The previous prime is 165506629. The next prime is 165506641. The reversal of 165506633 is 336605561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139169209 + 26337424 = 11797^2 + 5132^2 .

It is a cyclic number.

It is not a de Polignac number, because 165506633 - 2² = 165506629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165506593 and 165506602.

It is not a weakly prime, because it can be changed into another prime (165506533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82753316 + 82753317.

It is an arithmetic number, because the mean of its divisors is an integer number (82753317).

Almost surely, 2^165506633 is an apocalyptic number.

It is an amenable number.

165506633 is a deficient number, since it is larger than the sum of its proper divisors (1).

165506633 is an equidigital number, since it uses as much as digits as its factorization.

165506633 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 35.

The square root of 165506633 is about 12864.9381265516. The cubic root of 165506633 is about 549.0414521628.

The spelling of 165506633 in words is "one hundred sixty-five million, five hundred six thousand, six hundred thirty-three".