639196699 has 2 divisors, whose sum is σ = 639196700. Its totient is φ = 639196698.

The previous prime is 639196697. The next prime is 639196709. The reversal of 639196699 is 996691936.

639196699 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 639196699 - 2¹ = 639196697 is a prime.

Together with 639196697, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (639196697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319598349 + 319598350.

It is an arithmetic number, because the mean of its divisors is an integer number (319598350).

Almost surely, 2^639196699 is an apocalyptic number.

639196699 is a deficient number, since it is larger than the sum of its proper divisors (1).

639196699 is an equidigital number, since it uses as much as digits as its factorization.

639196699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4251528, while the sum is 58.

The square root of 639196699 is about 25282.3396662572. The cubic root of 639196699 is about 861.4131709857.

The spelling of 639196699 in words is "six hundred thirty-nine million, one hundred ninety-six thousand, six hundred ninety-nine".