12638275300621 has 8 divisors (see below), whose sum is σ = 12648903435000. Its totient is φ = 12627648445440.

The previous prime is 12638275300577. The next prime is 12638275300631. The reversal of 12638275300621 is 12600357283621.

12638275300621 = 2513789² + 2513790².

It can be written as a sum of positive squares in 4 ways, for example, as 2722005022500 + 9916270278121 = 1649850^2 + 3149011^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12638275300621 - 2⁷ = 12638275300493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12638275300631) 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, 19989181 + ... + 20611741.

It is an arithmetic number, because the mean of its divisors is an integer number (1581112929375).

Almost surely, 2^{12638275300621} is an apocalyptic number.

12638275300621 is the 2513790-th centered square number.

It is an amenable number.

12638275300621 is a deficient number, since it is larger than the sum of its proper divisors (10628134379).

12638275300621 is a wasteful number, since it uses less digits than its factorization.

12638275300621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639599.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 12638275300621 in words is "twelve trillion, six hundred thirty-eight billion, two hundred seventy-five million, three hundred thousand, six hundred twenty-one".