9987599966 has 4 divisors (see below), whose sum is σ = 14981399952. Its totient is φ = 4993799982.

The previous prime is 9987599957. The next prime is 9987600013. The reversal of 9987599966 is 6699957899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6699957899 = 29 ⋅231033031.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2496899990 + ... + 2496899993.

It is an arithmetic number, because the mean of its divisors is an integer number (3745349988).

Almost surely, 2^9987599966 is an apocalyptic number.

9987599966 is a deficient number, since it is larger than the sum of its proper divisors (4993799986).

9987599966 is a wasteful number, since it uses less digits than its factorization.

9987599966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4993799985.

The product of its digits is 595213920, while the sum is 77.

The square root of 9987599966 is about 99937.9805979689. The cubic root of 9987599966 is about 2153.5438195893.

The spelling of 9987599966 in words is "nine billion, nine hundred eighty-seven million, five hundred ninety-nine thousand, nine hundred sixty-six".