163731399899 has 2 divisors, whose sum is σ = 163731399900. Its totient is φ = 163731399898.

The previous prime is 163731399827. The next prime is 163731399913. The reversal of 163731399899 is 998993137361.

It is a strong prime.

It is an emirp because it is prime and its reverse (998993137361) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163731399899 is a prime.

It is not a weakly prime, because it can be changed into another prime (163736399899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81865699949 + 81865699950.

It is an arithmetic number, because the mean of its divisors is an integer number (81865699950).

Almost surely, 2^163731399899 is an apocalyptic number.

163731399899 is a deficient number, since it is larger than the sum of its proper divisors (1).

163731399899 is an equidigital number, since it uses as much as digits as its factorization.

163731399899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 59521392, while the sum is 68.

The spelling of 163731399899 in words is "one hundred sixty-three billion, seven hundred thirty-one million, three hundred ninety-nine thousand, eight hundred ninety-nine".