11001999959 has 4 divisors (see below), whose sum is σ = 11002214400. Its totient is φ = 11001785520.

The previous prime is 11001999949. The next prime is 11002000001. The reversal of 11001999959 is 95999910011.

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 11001999959 - 2¹² = 11001995863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11001999959.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001999949) 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, 20267 + ... + 149715.

It is an arithmetic number, because the mean of its divisors is an integer number (2750553600).

Almost surely, 2^11001999959 is an apocalyptic number.

11001999959 is a deficient number, since it is larger than the sum of its proper divisors (214441).

11001999959 is an equidigital number, since it uses as much as digits as its factorization.

11001999959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214440.

The product of its (nonzero) digits is 295245, while the sum is 53.

The spelling of 11001999959 in words is "eleven billion, one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".