6405253664 has 24 divisors (see below), whose sum is σ = 13045184460. Its totient is φ = 3092190976.

The previous prime is 6405253663. The next prime is 6405253669. The reversal of 6405253664 is 4663525046.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6294835600 + 110418064 = 79340^2 + 10508^2 .

It is not an unprimeable number, because it can be changed into a prime (6405253663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3450179 + ... + 3452034.

Almost surely, 2^6405253664 is an apocalyptic number.

It is an amenable number.

6405253664 is an abundant number, since it is smaller than the sum of its proper divisors (6639930796).

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

6405253664 is a wasteful number, since it uses less digits than its factorization.

6405253664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6902252 (or 6902244 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 41.

The square root of 6405253664 is about 80032.8286642425. The cubic root of 6405253664 is about 1857.1434225842.

The spelling of 6405253664 in words is "six billion, four hundred five million, two hundred fifty-three thousand, six hundred sixty-four".