165215526366601 has 2 divisors, whose sum is σ = 165215526366602. Its totient is φ = 165215526366600.

The previous prime is 165215526366593. The next prime is 165215526366661. The reversal of 165215526366601 is 106663625512561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135547340550400 + 29668185816201 = 11642480^2 + 5446851^2 .

It is a cyclic number.

It is not a de Polignac number, because 165215526366601 - 2³ = 165215526366593 is a prime.

It is not a weakly prime, because it can be changed into another prime (165215526366661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82607763183300 + 82607763183301.

It is an arithmetic number, because the mean of its divisors is an integer number (82607763183301).

Almost surely, 2^{165215526366601} is an apocalyptic number.

It is an amenable number.

165215526366601 is a deficient number, since it is larger than the sum of its proper divisors (1).

165215526366601 is an equidigital number, since it uses as much as digits as its factorization.

165215526366601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664000, while the sum is 55.

The spelling of 165215526366601 in words is "one hundred sixty-five trillion, two hundred fifteen billion, five hundred twenty-six million, three hundred sixty-six thousand, six hundred one".