3999633652879 has 2 divisors, whose sum is σ = 3999633652880. Its totient is φ = 3999633652878.

The previous prime is 3999633652853. The next prime is 3999633652909. The reversal of 3999633652879 is 9782563369993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3999633652879 - 2²¹ = 3999631555727 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3999633652799 and 3999633652808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999633652849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999816826439 + 1999816826440.

It is an arithmetic number, because the mean of its divisors is an integer number (1999816826440).

Almost surely, 2^{3999633652879} is an apocalyptic number.

3999633652879 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999633652879 is an equidigital number, since it uses as much as digits as its factorization.

3999633652879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3571283520, while the sum is 79.

The spelling of 3999633652879 in words is "three trillion, nine hundred ninety-nine billion, six hundred thirty-three million, six hundred fifty-two thousand, eight hundred seventy-nine".