161660063137 has 2 divisors, whose sum is σ = 161660063138. Its totient is φ = 161660063136.

The previous prime is 161660063111. The next prime is 161660063221. The reversal of 161660063137 is 731360066161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112549514256 + 49110548881 = 335484^2 + 221609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161660063137 is a prime.

It is a super-2 number, since 2×161660063137² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161660063137.

It is not a weakly prime, because it can be changed into another prime (161660060137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80830031568 + 80830031569.

It is an arithmetic number, because the mean of its divisors is an integer number (80830031569).

Almost surely, 2^161660063137 is an apocalyptic number.

It is an amenable number.

161660063137 is a deficient number, since it is larger than the sum of its proper divisors (1).

161660063137 is an equidigital number, since it uses as much as digits as its factorization.

161660063137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The spelling of 161660063137 in words is "one hundred sixty-one billion, six hundred sixty million, sixty-three thousand, one hundred thirty-seven".