799999999906 has 4 divisors (see below), whose sum is σ = 1199999999862. Its totient is φ = 399999999952.

The previous prime is 799999999889. The next prime is 799999999991. The reversal of 799999999906 is 609999999997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 609999999997 = 17 ⋅35882352941.

It can be written as a sum of positive squares in only one way, i.e., 788705624281 + 11294375625 = 888091^2 + 106275^2 .

It is a Smith number, since the sum of its digits (94) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 199999999975 + ... + 199999999978.

Almost surely, 2^799999999906 is an apocalyptic number.

799999999906 is a deficient number, since it is larger than the sum of its proper divisors (399999999956).

799999999906 is a wasteful number, since it uses less digits than its factorization.

799999999906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399999999955.

The product of its (nonzero) digits is 16271660538, while the sum is 94.

The spelling of 799999999906 in words is "seven hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred six".