161763376849 has 2 divisors, whose sum is σ = 161763376850. Its totient is φ = 161763376848.

The previous prime is 161763376847. The next prime is 161763376867. The reversal of 161763376849 is 948673367161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 158034076225 + 3729300624 = 397535^2 + 61068^2 .

It is a cyclic number.

It is not a de Polignac number, because 161763376849 - 2¹ = 161763376847 is a prime.

It is a super-3 number, since 3×161763376849³ (a number of 35 digits) contains 333 as substring.

Together with 161763376847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161763376843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80881688424 + 80881688425.

It is an arithmetic number, because the mean of its divisors is an integer number (80881688425).

Almost surely, 2^161763376849 is an apocalyptic number.

It is an amenable number.

161763376849 is a deficient number, since it is larger than the sum of its proper divisors (1).

161763376849 is an equidigital number, since it uses as much as digits as its factorization.

161763376849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 61.

The spelling of 161763376849 in words is "one hundred sixty-one billion, seven hundred sixty-three million, three hundred seventy-six thousand, eight hundred forty-nine".