638383075552 has 48 divisors (see below), whose sum is σ = 1278263231280. Its totient is φ = 313746020352.

The previous prime is 638383075543. The next prime is 638383075553. The reversal of 638383075552 is 255570383836.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 638383075493 and 638383075502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638383075553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26180038 + ... + 26204410.

It is an arithmetic number, because the mean of its divisors is an integer number (26630483985).

Almost surely, 2^638383075552 is an apocalyptic number.

It is an amenable number.

638383075552 is an abundant number, since it is smaller than the sum of its proper divisors (639880155728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638383075552 is a wasteful number, since it uses less digits than its factorization.

638383075552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38315 (or 38307 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 638383075552 in words is "six hundred thirty-eight billion, three hundred eighty-three million, seventy-five thousand, five hundred fifty-two".