3643996639 has 2 divisors, whose sum is σ = 3643996640. Its totient is φ = 3643996638.

The previous prime is 3643996637. The next prime is 3643996717. The reversal of 3643996639 is 9366993463.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3643996639 - 2¹ = 3643996637 is a prime.

Together with 3643996637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3643996637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821998319 + 1821998320.

It is an arithmetic number, because the mean of its divisors is an integer number (1821998320).

Almost surely, 2^3643996639 is an apocalyptic number.

3643996639 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643996639 is an equidigital number, since it uses as much as digits as its factorization.

3643996639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17006112, while the sum is 58.

The square root of 3643996639 is about 60365.5252524154. The cubic root of 3643996639 is about 1538.8371272659.

The spelling of 3643996639 in words is "three billion, six hundred forty-three million, nine hundred ninety-six thousand, six hundred thirty-nine".