638707010647 has 2 divisors, whose sum is σ = 638707010648. Its totient is φ = 638707010646.

The previous prime is 638707010609. The next prime is 638707010681. The reversal of 638707010647 is 746010707836.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638707010647 - 2²³ = 638698622039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638707010647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638707010147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319353505323 + 319353505324.

It is an arithmetic number, because the mean of its divisors is an integer number (319353505324).

Almost surely, 2^638707010647 is an apocalyptic number.

638707010647 is a deficient number, since it is larger than the sum of its proper divisors (1).

638707010647 is an equidigital number, since it uses as much as digits as its factorization.

638707010647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The spelling of 638707010647 in words is "six hundred thirty-eight billion, seven hundred seven million, ten thousand, six hundred forty-seven".