638842603268 has 12 divisors (see below), whose sum is σ = 1117987842972. Its totient is φ = 319417505280.

The previous prime is 638842603229. The next prime is 638842603307. The reversal of 638842603268 is 862306248836.

638842603268 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (638842603229) and next prime (638842603307).

It can be written as a sum of positive squares in 2 ways, for example, as 561273669124 + 77568934144 = 749182^2 + 278512^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552005 + ... + 1257932.

It is an arithmetic number, because the mean of its divisors is an integer number (93165653581).

Almost surely, 2^638842603268 is an apocalyptic number.

It is an amenable number.

638842603268 is a deficient number, since it is larger than the sum of its proper divisors (479145239704).

638842603268 is a wasteful number, since it uses less digits than its factorization.

638842603268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1898182 (or 1898180 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 56.

The spelling of 638842603268 in words is "six hundred thirty-eight billion, eight hundred forty-two million, six hundred three thousand, two hundred sixty-eight".