11001559987 has 32 divisors (see below), whose sum is σ = 12912768000. Its totient is φ = 9267747840.

The previous prime is 11001559981. The next prime is 11001560033. The reversal of 11001559987 is 78995510011.

It is a cyclic number.

It is not a de Polignac number, because 11001559987 - 2¹⁵ = 11001527219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11001559981) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 1796643 + ... + 1802755.

It is an arithmetic number, because the mean of its divisors is an integer number (403524000).

Almost surely, 2^11001559987 is an apocalyptic number.

11001559987 is a deficient number, since it is larger than the sum of its proper divisors (1911208013).

11001559987 is a wasteful number, since it uses less digits than its factorization.

11001559987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6331.

The product of its (nonzero) digits is 113400, while the sum is 46.

The spelling of 11001559987 in words is "eleven billion, one million, five hundred fifty-nine thousand, nine hundred eighty-seven".