161911839659 has 2 divisors, whose sum is σ = 161911839660. Its totient is φ = 161911839658.

The previous prime is 161911839647. The next prime is 161911839709. The reversal of 161911839659 is 956938119161.

It is a weak prime.

It is an emirp because it is prime and its reverse (956938119161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161911839659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161911839598 and 161911839607.

It is not a weakly prime, because it can be changed into another prime (161911832659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80955919829 + 80955919830.

It is an arithmetic number, because the mean of its divisors is an integer number (80955919830).

Almost surely, 2^161911839659 is an apocalyptic number.

161911839659 is a deficient number, since it is larger than the sum of its proper divisors (1).

161911839659 is an equidigital number, since it uses as much as digits as its factorization.

161911839659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3149280, while the sum is 59.

The spelling of 161911839659 in words is "one hundred sixty-one billion, nine hundred eleven million, eight hundred thirty-nine thousand, six hundred fifty-nine".