161617964143 has 2 divisors, whose sum is σ = 161617964144. Its totient is φ = 161617964142.

The previous prime is 161617964111. The next prime is 161617964147. The reversal of 161617964143 is 341469716161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161617964143 - 2⁵ = 161617964111 is a prime.

It is a super-2 number, since 2×161617964143² (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 (161617964147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80808982071 + 80808982072.

It is an arithmetic number, because the mean of its divisors is an integer number (80808982072).

Almost surely, 2^161617964143 is an apocalyptic number.

161617964143 is a deficient number, since it is larger than the sum of its proper divisors (1).

161617964143 is an equidigital number, since it uses as much as digits as its factorization.

161617964143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 161617964143 in words is "one hundred sixty-one billion, six hundred seventeen million, nine hundred sixty-four thousand, one hundred forty-three".