165145661506663 has 2 divisors, whose sum is σ = 165145661506664. Its totient is φ = 165145661506662.

The previous prime is 165145661506613. The next prime is 165145661506687. The reversal of 165145661506663 is 366605166541561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165145661506663 - 2³³ = 165137071572071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165145661506613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82572830753331 + 82572830753332.

It is an arithmetic number, because the mean of its divisors is an integer number (82572830753332).

Almost surely, 2^{165145661506663} is an apocalyptic number.

165145661506663 is a deficient number, since it is larger than the sum of its proper divisors (1).

165145661506663 is an equidigital number, since it uses as much as digits as its factorization.

165145661506663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984000, while the sum is 61.

The spelling of 165145661506663 in words is "one hundred sixty-five trillion, one hundred forty-five billion, six hundred sixty-one million, five hundred six thousand, six hundred sixty-three".