161340036643 has 2 divisors, whose sum is σ = 161340036644. Its totient is φ = 161340036642.

The previous prime is 161340036589. The next prime is 161340036661. The reversal of 161340036643 is 346630043161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161340036643 is a prime.

It is not a weakly prime, because it can be changed into another prime (161340036043) 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, 80670018321 + 80670018322.

It is an arithmetic number, because the mean of its divisors is an integer number (80670018322).

Almost surely, 2^161340036643 is an apocalyptic number.

161340036643 is a deficient number, since it is larger than the sum of its proper divisors (1).

161340036643 is an equidigital number, since it uses as much as digits as its factorization.

161340036643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 37.

The spelling of 161340036643 in words is "one hundred sixty-one billion, three hundred forty million, thirty-six thousand, six hundred forty-three".