165151505560081 has 2 divisors, whose sum is σ = 165151505560082. Its totient is φ = 165151505560080.

The previous prime is 165151505560051. The next prime is 165151505560133. The reversal of 165151505560081 is 180065505151561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163450880913681 + 1700624646400 = 12784791^2 + 1304080^2 .

It is a cyclic number.

It is not a de Polignac number, because 165151505560081 - 2¹⁵ = 165151505527313 is a prime.

It is a super-2 number, since 2×165151505560081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165151505560031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82575752780040 + 82575752780041.

It is an arithmetic number, because the mean of its divisors is an integer number (82575752780041).

Almost surely, 2^{165151505560081} is an apocalyptic number.

It is an amenable number.

165151505560081 is a deficient number, since it is larger than the sum of its proper divisors (1).

165151505560081 is an equidigital number, since it uses as much as digits as its factorization.

165151505560081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900000, while the sum is 49.

The spelling of 165151505560081 in words is "one hundred sixty-five trillion, one hundred fifty-one billion, five hundred five million, five hundred sixty thousand, eighty-one".