638654026268 has 12 divisors (see below), whose sum is σ = 1117665639552. Its totient is φ = 319320986400.

The previous prime is 638654026259. The next prime is 638654026327. The reversal of 638654026268 is 862620456836.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1263905 + ... + 1695512.

It is an arithmetic number, because the mean of its divisors is an integer number (93138803296).

Almost surely, 2^638654026268 is an apocalyptic number.

It is an amenable number.

638654026268 is a deficient number, since it is larger than the sum of its proper divisors (479011613284).

638654026268 is a wasteful number, since it uses less digits than its factorization.

638654026268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3013372 (or 3013370 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 56.

The spelling of 638654026268 in words is "six hundred thirty-eight billion, six hundred fifty-four million, twenty-six thousand, two hundred sixty-eight".