159643495993 has 4 divisors (see below), whose sum is σ = 159741019620. Its totient is φ = 159545972368.

The previous prime is 159643495981. The next prime is 159643496009. The reversal of 159643495993 is 399594346951.

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

It can be written as a sum of positive squares in 2 ways, for example, as 35279357584 + 124364138409 = 187828^2 + 352653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159643495993 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159643493993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48759358 + ... + 48762631.

It is an arithmetic number, because the mean of its divisors is an integer number (39935254905).

Almost surely, 2^159643495993 is an apocalyptic number.

It is an amenable number.

159643495993 is a deficient number, since it is larger than the sum of its proper divisors (97523627).

159643495993 is an equidigital number, since it uses as much as digits as its factorization.

159643495993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97523626.

The product of its digits is 141717600, while the sum is 67.

The spelling of 159643495993 in words is "one hundred fifty-nine billion, six hundred forty-three million, four hundred ninety-five thousand, nine hundred ninety-three".