999556699 has 2 divisors, whose sum is σ = 999556700. Its totient is φ = 999556698.

The previous prime is 999556697. The next prime is 999556711. The reversal of 999556699 is 996655999.

999556699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999556699 - 2¹ = 999556697 is a prime.

It is a super-2 number, since 2×999556699² = 1998227189031553202, which contains 22 as substring.

Together with 999556697, it forms a pair of twin primes.

It is a zygodrome in base 10.

It is not a weakly prime, because it can be changed into another prime (999556697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499778349 + 499778350.

It is an arithmetic number, because the mean of its divisors is an integer number (499778350).

Almost surely, 2^999556699 is an apocalyptic number.

999556699 is a deficient number, since it is larger than the sum of its proper divisors (1).

999556699 is an equidigital number, since it uses as much as digits as its factorization.

999556699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53144100, while the sum is 67.

The square root of 999556699 is about 31615.7666204696. The cubic root of 999556699 is about 999.8522111595.

The spelling of 999556699 in words is "nine hundred ninety-nine million, five hundred fifty-six thousand, six hundred ninety-nine".