165561151101529 has 2 divisors, whose sum is σ = 165561151101530. Its totient is φ = 165561151101528.

The previous prime is 165561151101527. The next prime is 165561151101581. The reversal of 165561151101529 is 925101151165561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83141571240000 + 82419579861529 = 9118200^2 + 9078523^2 .

It is a cyclic number.

It is not a de Polignac number, because 165561151101529 - 2¹ = 165561151101527 is a prime.

It is a super-2 number, since 2×165561151101529² (a number of 29 digits) contains 22 as substring.

Together with 165561151101527, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (165561151101527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780575550764 + 82780575550765.

It is an arithmetic number, because the mean of its divisors is an integer number (82780575550765).

Almost surely, 2^{165561151101529} is an apocalyptic number.

It is an amenable number.

165561151101529 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561151101529 is an equidigital number, since it uses as much as digits as its factorization.

165561151101529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405000, while the sum is 49.

The spelling of 165561151101529 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, one hundred one thousand, five hundred twenty-nine".