165601612540057 has 2 divisors, whose sum is σ = 165601612540058. Its totient is φ = 165601612540056.

The previous prime is 165601612539991. The next prime is 165601612540121. The reversal of 165601612540057 is 750045216106561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103959313249936 + 61642299290121 = 10196044^2 + 7851261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165601612540057 is a prime.

It is not a weakly prime, because it can be changed into another prime (165601612540157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82800806270028 + 82800806270029.

It is an arithmetic number, because the mean of its divisors is an integer number (82800806270029).

Almost surely, 2^{165601612540057} is an apocalyptic number.

It is an amenable number.

165601612540057 is a deficient number, since it is larger than the sum of its proper divisors (1).

165601612540057 is an equidigital number, since it uses as much as digits as its factorization.

165601612540057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512000, while the sum is 49.

The spelling of 165601612540057 in words is "one hundred sixty-five trillion, six hundred one billion, six hundred twelve million, five hundred forty thousand, fifty-seven".