161648016737 has 2 divisors, whose sum is σ = 161648016738. Its totient is φ = 161648016736.

The previous prime is 161648016731. The next prime is 161648016757. The reversal of 161648016737 is 737610846161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89678687296 + 71969329441 = 299464^2 + 268271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161648016737 is a prime.

It is a super-2 number, since 2×161648016737² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161648016731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80824008368 + 80824008369.

It is an arithmetic number, because the mean of its divisors is an integer number (80824008369).

Almost surely, 2^161648016737 is an apocalyptic number.

It is an amenable number.

161648016737 is a deficient number, since it is larger than the sum of its proper divisors (1).

161648016737 is an equidigital number, since it uses as much as digits as its factorization.

161648016737 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 161648016737 in words is "one hundred sixty-one billion, six hundred forty-eight million, sixteen thousand, seven hundred thirty-seven".