165561151060523 has 2 divisors, whose sum is σ = 165561151060524. Its totient is φ = 165561151060522.

The previous prime is 165561151060489. The next prime is 165561151060573. The reversal of 165561151060523 is 325060151165561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165561151060523 - 2²⁰ = 165561150011947 is a prime.

It is not a weakly prime, because it can be changed into another prime (165561151060573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780575530261 + 82780575530262.

It is an arithmetic number, because the mean of its divisors is an integer number (82780575530262).

Almost surely, 2^{165561151060523} is an apocalyptic number.

165561151060523 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561151060523 is an equidigital number, since it uses as much as digits as its factorization.

165561151060523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 165561151060523 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, sixty thousand, five hundred twenty-three".