161768257667 has 2 divisors, whose sum is σ = 161768257668. Its totient is φ = 161768257666.

The previous prime is 161768257643. The next prime is 161768257723. The reversal of 161768257667 is 766752867161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161768257667 is a prime.

It is not a weakly prime, because it can be changed into another prime (161768256667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80884128833 + 80884128834.

It is an arithmetic number, because the mean of its divisors is an integer number (80884128834).

Almost surely, 2^161768257667 is an apocalyptic number.

161768257667 is a deficient number, since it is larger than the sum of its proper divisors (1).

161768257667 is an equidigital number, since it uses as much as digits as its factorization.

161768257667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 35562240, while the sum is 62.

The spelling of 161768257667 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, two hundred fifty-seven thousand, six hundred sixty-seven".