161510161243 has 2 divisors, whose sum is σ = 161510161244. Its totient is φ = 161510161242.

The previous prime is 161510161139. The next prime is 161510161247. The reversal of 161510161243 is 342161015161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161510161243 is a prime.

It is not a weakly prime, because it can be changed into another prime (161510161247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80755080621 + 80755080622.

It is an arithmetic number, because the mean of its divisors is an integer number (80755080622).

Almost surely, 2^161510161243 is an apocalyptic number.

161510161243 is a deficient number, since it is larger than the sum of its proper divisors (1).

161510161243 is an equidigital number, since it uses as much as digits as its factorization.

161510161243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 161510161243 in words is "one hundred sixty-one billion, five hundred ten million, one hundred sixty-one thousand, two hundred forty-three".