159557812987 has 4 divisors (see below), whose sum is σ = 161480196360. Its totient is φ = 157635429616.

The previous prime is 159557812927. The next prime is 159557812993. The reversal of 159557812987 is 789218755951.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 159557812987 - 2¹⁵ = 159557780219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159557812927) 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, 961191562 + ... + 961191727.

It is an arithmetic number, because the mean of its divisors is an integer number (40370049090).

Almost surely, 2^159557812987 is an apocalyptic number.

159557812987 is a deficient number, since it is larger than the sum of its proper divisors (1922383373).

159557812987 is an equidigital number, since it uses as much as digits as its factorization.

159557812987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922383372.

The product of its digits is 63504000, while the sum is 67.

The spelling of 159557812987 in words is "one hundred fifty-nine billion, five hundred fifty-seven million, eight hundred twelve thousand, nine hundred eighty-seven".