161603430913 has 2 divisors, whose sum is σ = 161603430914. Its totient is φ = 161603430912.

The previous prime is 161603430899. The next prime is 161603430949. The reversal of 161603430913 is 319034306161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148836238849 + 12767192064 = 385793^2 + 112992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161603430913 is a prime.

It is a super-2 number, since 2×161603430913² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161603430413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80801715456 + 80801715457.

It is an arithmetic number, because the mean of its divisors is an integer number (80801715457).

Almost surely, 2^161603430913 is an apocalyptic number.

It is an amenable number.

161603430913 is a deficient number, since it is larger than the sum of its proper divisors (1).

161603430913 is an equidigital number, since it uses as much as digits as its factorization.

161603430913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 37.

The spelling of 161603430913 in words is "one hundred sixty-one billion, six hundred three million, four hundred thirty thousand, nine hundred thirteen".