161396215919 has 2 divisors, whose sum is σ = 161396215920. Its totient is φ = 161396215918.

The previous prime is 161396215909. The next prime is 161396215943. The reversal of 161396215919 is 919512693161.

It is a weak prime.

It is an emirp because it is prime and its reverse (919512693161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161396215919 is a prime.

It is a super-2 number, since 2×161396215919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161396215909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80698107959 + 80698107960.

It is an arithmetic number, because the mean of its divisors is an integer number (80698107960).

Almost surely, 2^161396215919 is an apocalyptic number.

161396215919 is a deficient number, since it is larger than the sum of its proper divisors (1).

161396215919 is an equidigital number, since it uses as much as digits as its factorization.

161396215919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 787320, while the sum is 53.

The spelling of 161396215919 in words is "one hundred sixty-one billion, three hundred ninety-six million, two hundred fifteen thousand, nine hundred nineteen".