638552532485 has 16 divisors (see below), whose sum is σ = 896094984576. Its totient is φ = 427681695168.

The previous prime is 638552532469. The next prime is 638552532487. The reversal of 638552532485 is 584235255836.

It is not a de Polignac number, because 638552532485 - 2⁴ = 638552532469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 638552532485.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638552532487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 212142194 + ... + 212145203.

It is an arithmetic number, because the mean of its divisors is an integer number (56005936536).

Almost surely, 2^638552532485 is an apocalyptic number.

It is an amenable number.

638552532485 is a deficient number, since it is larger than the sum of its proper divisors (257542452091).

638552532485 is a wasteful number, since it uses less digits than its factorization.

638552532485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424287452.

The product of its digits is 34560000, while the sum is 56.

The spelling of 638552532485 in words is "six hundred thirty-eight billion, five hundred fifty-two million, five hundred thirty-two thousand, four hundred eighty-five".