6397657818552 has 768 divisors, whose sum is σ = 25455857817600. Its totient is φ = 1443665203200.

The previous prime is 6397657818521. The next prime is 6397657818557. The reversal of 6397657818552 is 2558187567936.

6397657818552 is a `hidden beast` number, since 6 + 3 + 9 + 7 + 6 + 57 + 8 + 18 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6397657818557) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 40353277 + ... + 40511507.

It is an arithmetic number, because the mean of its divisors is an integer number (33145648200).

Almost surely, 2^{6397657818552} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6397657818552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12727928908800).

6397657818552 is an abundant number, since it is smaller than the sum of its proper divisors (19058199999048).

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

6397657818552 is a wasteful number, since it uses less digits than its factorization.

6397657818552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158305 (or 158284 counting only the distinct ones).

The product of its digits is 762048000, while the sum is 72.

The spelling of 6397657818552 in words is "six trillion, three hundred ninety-seven billion, six hundred fifty-seven million, eight hundred eighteen thousand, five hundred fifty-two".