161345687369 has 2 divisors, whose sum is σ = 161345687370. Its totient is φ = 161345687368.

The previous prime is 161345687357. The next prime is 161345687387. The reversal of 161345687369 is 963786543161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158694673225 + 2651014144 = 398365^2 + 51488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161345687369 is a prime.

It is a super-2 number, since 2×161345687369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161345687669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80672843684 + 80672843685.

It is an arithmetic number, because the mean of its divisors is an integer number (80672843685).

Almost surely, 2^161345687369 is an apocalyptic number.

It is an amenable number.

161345687369 is a deficient number, since it is larger than the sum of its proper divisors (1).

161345687369 is an equidigital number, since it uses as much as digits as its factorization.

161345687369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 59.

The spelling of 161345687369 in words is "one hundred sixty-one billion, three hundred forty-five million, six hundred eighty-seven thousand, three hundred sixty-nine".