6457568881 has 27 divisors (see below), whose sum is σ = 7148324001. Its totient is φ = 5832134784.

The previous prime is 6457568869. The next prime is 6457568911. The reversal of 6457568881 is 1888657546.

The square root of 6457568881 is 80359.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 638320225 + 5819248656 = 25265^2 + 76284^2 .

It is not a de Polignac number, because 6457568881 - 2⁷ = 6457568753 is a prime.

It is a super-2 number, since 2×6457568881² = 83400391705719184322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6457568861) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 39616906 + ... + 39617068.

Almost surely, 2^6457568881 is an apocalyptic number.

6457568881 is the 80359-th square number.

6457568881 is the 40180-th centered octagonal number.

It is an amenable number.

6457568881 is a deficient number, since it is larger than the sum of its proper divisors (690755120).

6457568881 is an equidigital number, since it uses as much as digits as its factorization.

6457568881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 209 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 58.

The cubic root of 6457568881 is about 1862.1858220922.

The spelling of 6457568881 in words is "six billion, four hundred fifty-seven million, five hundred sixty-eight thousand, eight hundred eighty-one".