159873636722 has 18 divisors (see below), whose sum is σ = 241397630253. Its totient is φ = 79411221432.

The previous prime is 159873636721. The next prime is 159873636731. The reversal of 159873636722 is 227636378951.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 157576447681 + 2297189041 = 396959^2 + 47929^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=282731.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159873636721) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 94431308 + ... + 94433000.

Almost surely, 2^159873636722 is an apocalyptic number.

159873636722 is a deficient number, since it is larger than the sum of its proper divisors (81523993531).

159873636722 is an frugal number, since it uses more digits than its factorization.

159873636722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722 (or 1862 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 59.

The spelling of 159873636722 in words is "one hundred fifty-nine billion, eight hundred seventy-three million, six hundred thirty-six thousand, seven hundred twenty-two".