159717643894 has 4 divisors (see below), whose sum is σ = 239576465844. Its totient is φ = 79858821946.

The previous prime is 159717643867. The next prime is 159717643907. The reversal of 159717643894 is 498346717951.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39929410972 + ... + 39929410975.

It is an arithmetic number, because the mean of its divisors is an integer number (59894116461).

Almost surely, 2^159717643894 is an apocalyptic number.

159717643894 is a deficient number, since it is larger than the sum of its proper divisors (79858821950).

159717643894 is an equidigital number, since it uses as much as digits as its factorization.

159717643894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79858821949.

The product of its digits is 45722880, while the sum is 64.

The spelling of 159717643894 in words is "one hundred fifty-nine billion, seven hundred seventeen million, six hundred forty-three thousand, eight hundred ninety-four".