161801701769 has 2 divisors, whose sum is σ = 161801701770. Its totient is φ = 161801701768.

The previous prime is 161801701717. The next prime is 161801701793. The reversal of 161801701769 is 967107108161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152031367744 + 9770334025 = 389912^2 + 98845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161801701769 is a prime.

It is a super-2 number, since 2×161801701769² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161801701709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80900850884 + 80900850885.

It is an arithmetic number, because the mean of its divisors is an integer number (80900850885).

Almost surely, 2^161801701769 is an apocalyptic number.

It is an amenable number.

161801701769 is a deficient number, since it is larger than the sum of its proper divisors (1).

161801701769 is an equidigital number, since it uses as much as digits as its factorization.

161801701769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 127008, while the sum is 47.

The spelling of 161801701769 in words is "one hundred sixty-one billion, eight hundred one million, seven hundred one thousand, seven hundred sixty-nine".