999979999996 has 24 divisors (see below), whose sum is σ = 1752060870000. Its totient is φ = 499391481600.

The previous prime is 999979999987. The next prime is 999980000029. The reversal of 999979999996 is 699999979999.

It is a junction number, because it is equal to n+sod(n) for n = 999979999895 and 999979999904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13999380 + ... + 14070628.

It is an arithmetic number, because the mean of its divisors is an integer number (73002536250).

Almost surely, 2^999979999996 is an apocalyptic number.

It is an amenable number.

999979999996 is a deficient number, since it is larger than the sum of its proper divisors (752080870004).

999979999996 is a wasteful number, since it uses less digits than its factorization.

999979999996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75405 (or 75403 counting only the distinct ones).

The product of its digits is 146444944842, while the sum is 103.

The spelling of 999979999996 in words is "nine hundred ninety-nine billion, nine hundred seventy-nine million, nine hundred ninety-nine thousand, nine hundred ninety-six".