11951987005 has 32 divisors (see below), whose sum is σ = 16572960000. Its totient is φ = 8105011200.

The previous prime is 11951986999. The next prime is 11951987011. The reversal of 11951987005 is 50078915911.

11951987005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11951986999) and next prime (11951987011).

It is a de Polignac number, because none of the positive numbers 2^k-11951987005 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4413862 + ... + 4416568.

It is an arithmetic number, because the mean of its divisors is an integer number (517905000).

Almost surely, 2^11951987005 is an apocalyptic number.

It is an amenable number.

11951987005 is a deficient number, since it is larger than the sum of its proper divisors (4620972995).

11951987005 is a wasteful number, since it uses less digits than its factorization.

11951987005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4069.

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

The spelling of 11951987005 in words is "eleven billion, nine hundred fifty-one million, nine hundred eighty-seven thousand, five".