638475425267 has 2 divisors, whose sum is σ = 638475425268. Its totient is φ = 638475425266.

The previous prime is 638475425239. The next prime is 638475425293. The reversal of 638475425267 is 762524574836.

638475425267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 638475425267 - 2⁸ = 638475425011 is a prime.

It is not a weakly prime, because it can be changed into another prime (638475725267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319237712633 + 319237712634.

It is an arithmetic number, because the mean of its divisors is an integer number (319237712634).

Almost surely, 2^638475425267 is an apocalyptic number.

638475425267 is a deficient number, since it is larger than the sum of its proper divisors (1).

638475425267 is an equidigital number, since it uses as much as digits as its factorization.

638475425267 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67737600, while the sum is 59.

The spelling of 638475425267 in words is "six hundred thirty-eight billion, four hundred seventy-five million, four hundred twenty-five thousand, two hundred sixty-seven".