163731399857 has 8 divisors (see below), whose sum is σ = 167817539232. Its totient is φ = 159649674400.

The previous prime is 163731399827. The next prime is 163731399899. The reversal of 163731399857 is 758993137361.

163731399857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163731399857 - 2¹² = 163731395761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163731399857.

It is not an unprimeable number, because it can be changed into a prime (163731399817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028303 + ... + 1176804.

It is an arithmetic number, because the mean of its divisors is an integer number (20977192404).

Almost surely, 2^163731399857 is an apocalyptic number.

It is an amenable number.

163731399857 is a deficient number, since it is larger than the sum of its proper divisors (4086139375).

163731399857 is a wasteful number, since it uses less digits than its factorization.

163731399857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206959.

The product of its digits is 25719120, while the sum is 62.

The spelling of 163731399857 in words is "one hundred sixty-three billion, seven hundred thirty-one million, three hundred ninety-nine thousand, eight hundred fifty-seven".