161768257723 has 2 divisors, whose sum is σ = 161768257724. Its totient is φ = 161768257722.

The previous prime is 161768257667. The next prime is 161768257733. The reversal of 161768257723 is 327752867161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161768257723 is a prime.

It is not a weakly prime, because it can be changed into another prime (161768257733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80884128861 + 80884128862.

It is an arithmetic number, because the mean of its divisors is an integer number (80884128862).

Almost surely, 2^161768257723 is an apocalyptic number.

161768257723 is a deficient number, since it is larger than the sum of its proper divisors (1).

161768257723 is an equidigital number, since it uses as much as digits as its factorization.

161768257723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 55.

The spelling of 161768257723 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, two hundred fifty-seven thousand, seven hundred twenty-three".