638625881050 has 12 divisors (see below), whose sum is σ = 1187844138846. Its totient is φ = 255450352400.

The previous prime is 638625881027. The next prime is 638625881051. The reversal of 638625881050 is 50188526836.

It can be written as a sum of positive squares in 3 ways, for example, as 311360652009 + 327265229041 = 557997^2 + 572071^2 .

It is not an unprimeable number, because it can be changed into a prime (638625881051) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 6386258761 + ... + 6386258860.

Almost surely, 2^638625881050 is an apocalyptic number.

638625881050 is a deficient number, since it is larger than the sum of its proper divisors (549218257796).

638625881050 is a wasteful number, since it uses less digits than its factorization.

638625881050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12772517633 (or 12772517628 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 638625881050 in words is "six hundred thirty-eight billion, six hundred twenty-five million, eight hundred eighty-one thousand, fifty".