161782238791 has 2 divisors, whose sum is σ = 161782238792. Its totient is φ = 161782238790.

The previous prime is 161782238767. The next prime is 161782238819. The reversal of 161782238791 is 197832287161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161782238791 - 2⁵ = 161782238759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161782232791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80891119395 + 80891119396.

It is an arithmetic number, because the mean of its divisors is an integer number (80891119396).

Almost surely, 2^161782238791 is an apocalyptic number.

161782238791 is a deficient number, since it is larger than the sum of its proper divisors (1).

161782238791 is an equidigital number, since it uses as much as digits as its factorization.

161782238791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 55.

The spelling of 161782238791 in words is "one hundred sixty-one billion, seven hundred eighty-two million, two hundred thirty-eight thousand, seven hundred ninety-one".