207165011561 has 2 divisors, whose sum is σ = 207165011562. Its totient is φ = 207165011560.

The previous prime is 207165011503. The next prime is 207165011611. The reversal of 207165011561 is 165110561702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194198862400 + 12966149161 = 440680^2 + 113869^2 .

It is a cyclic number.

It is not a de Polignac number, because 207165011561 - 2³⁰ = 206091269737 is a prime.

It is not a weakly prime, because it can be changed into another prime (207165011161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103582505780 + 103582505781.

It is an arithmetic number, because the mean of its divisors is an integer number (103582505781).

Almost surely, 2^207165011561 is an apocalyptic number.

It is an amenable number.

207165011561 is a deficient number, since it is larger than the sum of its proper divisors (1).

207165011561 is an equidigital number, since it uses as much as digits as its factorization.

207165011561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 35.

The spelling of 207165011561 in words is "two hundred seven billion, one hundred sixty-five million, eleven thousand, five hundred sixty-one".