161311164551 has 2 divisors, whose sum is σ = 161311164552. Its totient is φ = 161311164550.

The previous prime is 161311164503. The next prime is 161311164563. The reversal of 161311164551 is 155461113161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161311164551 - 2²² = 161306970247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161311164451) 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, 80655582275 + 80655582276.

It is an arithmetic number, because the mean of its divisors is an integer number (80655582276).

Almost surely, 2^161311164551 is an apocalyptic number.

161311164551 is a deficient number, since it is larger than the sum of its proper divisors (1).

161311164551 is an equidigital number, since it uses as much as digits as its factorization.

161311164551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 35.

The spelling of 161311164551 in words is "one hundred sixty-one billion, three hundred eleven million, one hundred sixty-four thousand, five hundred fifty-one".