639200063947 has 2 divisors, whose sum is σ = 639200063948. Its totient is φ = 639200063946.

The previous prime is 639200063939. The next prime is 639200063987. The reversal of 639200063947 is 749360002936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639200063947 - 2³ = 639200063939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639200063947.

It is not a weakly prime, because it can be changed into another prime (639200063917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319600031973 + 319600031974.

It is an arithmetic number, because the mean of its divisors is an integer number (319600031974).

Almost surely, 2^639200063947 is an apocalyptic number.

639200063947 is a deficient number, since it is larger than the sum of its proper divisors (1).

639200063947 is an equidigital number, since it uses as much as digits as its factorization.

639200063947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 49.

The spelling of 639200063947 in words is "six hundred thirty-nine billion, two hundred million, sixty-three thousand, nine hundred forty-seven".