6456561940 has 12 divisors (see below), whose sum is σ = 13558780116. Its totient is φ = 2582624768.

The previous prime is 6456561907. The next prime is 6456561967. The reversal of 6456561940 is 491656546.

It can be written as a sum of positive squares in 2 ways, for example, as 3313614096 + 3142947844 = 57564^2 + 56062^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161414029 + ... + 161414068.

It is an arithmetic number, because the mean of its divisors is an integer number (1129898343).

Almost surely, 2^6456561940 is an apocalyptic number.

It is an amenable number.

6456561940 is an abundant number, since it is smaller than the sum of its proper divisors (7102218176).

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

6456561940 is a wasteful number, since it uses less digits than its factorization.

6456561940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322828106 (or 322828104 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The square root of 6456561940 is about 80352.7344898728. The cubic root of 6456561940 is about 1862.0890256683.

The spelling of 6456561940 in words is "six billion, four hundred fifty-six million, five hundred sixty-one thousand, nine hundred forty".