638550840100 has 18 divisors (see below), whose sum is σ = 1385655323234. Its totient is φ = 255420336000.

The previous prime is 638550840077. The next prime is 638550840101. The reversal of 638550840100 is 1048055836.

It can be written as a sum of positive squares in 3 ways, for example, as 195130693696 + 443420146404 = 441736^2 + 665898^2 .

It is not an unprimeable number, because it can be changed into a prime (638550840101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3192754101 + ... + 3192754300.

Almost surely, 2^638550840100 is an apocalyptic number.

It is an amenable number.

638550840100 is an abundant number, since it is smaller than the sum of its proper divisors (747104483134).

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

638550840100 is a wasteful number, since it uses less digits than its factorization.

638550840100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6385508415 (or 6385508408 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

Adding to 638550840100 its reverse (1048055836), we get a palindrome (639598895936).

The spelling of 638550840100 in words is "six hundred thirty-eight billion, five hundred fifty million, eight hundred forty thousand, one hundred".