6564903440 has 40 divisors (see below), whose sum is σ = 15434916120. Its totient is φ = 2596453376.

The previous prime is 6564903437. The next prime is 6564903461. The reversal of 6564903440 is 443094656.

It can be written as a sum of positive squares in 4 ways, for example, as 35617024 + 6529286416 = 5968^2 + 80804^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453899 + ... + 468138.

It is an arithmetic number, because the mean of its divisors is an integer number (385872903).

Almost surely, 2^6564903440 is an apocalyptic number.

It is an amenable number.

6564903440 is an abundant number, since it is smaller than the sum of its proper divisors (8870012680).

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

6564903440 is a wasteful number, since it uses less digits than its factorization.

6564903440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922139 (or 922133 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 41.

The square root of 6564903440 is about 81024.0917258565. The cubic root of 6564903440 is about 1872.4466283422.

The spelling of 6564903440 in words is "six billion, five hundred sixty-four million, nine hundred three thousand, four hundred forty".