161738268833 has 2 divisors, whose sum is σ = 161738268834. Its totient is φ = 161738268832.

The previous prime is 161738268773. The next prime is 161738268847. The reversal of 161738268833 is 338862837161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159674565649 + 2063703184 = 399593^2 + 45428^2 .

It is a cyclic number.

It is not a de Polignac number, because 161738268833 - 2²² = 161734074529 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (161738268893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80869134416 + 80869134417.

It is an arithmetic number, because the mean of its divisors is an integer number (80869134417).

Almost surely, 2^161738268833 is an apocalyptic number.

It is an amenable number.

161738268833 is a deficient number, since it is larger than the sum of its proper divisors (1).

161738268833 is an equidigital number, since it uses as much as digits as its factorization.

161738268833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 56.

The spelling of 161738268833 in words is "one hundred sixty-one billion, seven hundred thirty-eight million, two hundred sixty-eight thousand, eight hundred thirty-three".