161611101565037 has 2 divisors, whose sum is σ = 161611101565038. Its totient is φ = 161611101565036.

The previous prime is 161611101565031. The next prime is 161611101565057. The reversal of 161611101565037 is 730565101116161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149774983351081 + 11836118213956 = 12238259^2 + 3440366^2 .

It is a cyclic number.

It is not a de Polignac number, because 161611101565037 - 2¹⁴ = 161611101548653 is a prime.

It is a super-2 number, since 2×161611101565037² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161611101565031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80805550782518 + 80805550782519.

It is an arithmetic number, because the mean of its divisors is an integer number (80805550782519).

Almost surely, 2^{161611101565037} is an apocalyptic number.

It is an amenable number.

161611101565037 is a deficient number, since it is larger than the sum of its proper divisors (1).

161611101565037 is an equidigital number, since it uses as much as digits as its factorization.

161611101565037 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 113400, while the sum is 44.

The spelling of 161611101565037 in words is "one hundred sixty-one trillion, six hundred eleven billion, one hundred one million, five hundred sixty-five thousand, thirty-seven".