3991996639307 has 2 divisors, whose sum is σ = 3991996639308. Its totient is φ = 3991996639306.

The previous prime is 3991996639303. The next prime is 3991996639357. The reversal of 3991996639307 is 7039366991993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3991996639307 - 2² = 3991996639303 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991996639303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995998319653 + 1995998319654.

It is an arithmetic number, because the mean of its divisors is an integer number (1995998319654).

Almost surely, 2^{3991996639307} is an apocalyptic number.

3991996639307 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991996639307 is an equidigital number, since it uses as much as digits as its factorization.

3991996639307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 401769396, while the sum is 74.

The spelling of 3991996639307 in words is "three trillion, nine hundred ninety-one billion, nine hundred ninety-six million, six hundred thirty-nine thousand, three hundred seven".