999987943607 has 4 divisors (see below), whose sum is σ = 1034470286520. Its totient is φ = 965505600696.

The previous prime is 999987943501. The next prime is 999987943609. The reversal of 999987943607 is 706349789999.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999987943607 is a prime.

It is a super-2 number, since 2×999987943607² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999987943609) 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 3 ways as a sum of consecutive naturals, for example, 17241171413 + ... + 17241171470.

It is an arithmetic number, because the mean of its divisors is an integer number (258617571630).

Almost surely, 2^999987943607 is an apocalyptic number.

999987943607 is a deficient number, since it is larger than the sum of its proper divisors (34482342913).

999987943607 is a wasteful number, since it uses less digits than its factorization.

999987943607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34482342912.

The product of its (nonzero) digits is 1666598976, while the sum is 80.

The spelling of 999987943607 in words is "nine hundred ninety-nine billion, nine hundred eighty-seven million, nine hundred forty-three thousand, six hundred seven".