6564646425 has 24 divisors (see below), whose sum is σ = 10868568256. Its totient is φ = 3496299840.

The previous prime is 6564646423. The next prime is 6564646447. The reversal of 6564646425 is 5246464656.

It is not a de Polignac number, because 6564646425 - 2¹ = 6564646423 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6564646423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5674 + ... + 114723.

Almost surely, 2^6564646425 is an apocalyptic number.

It is an amenable number.

6564646425 is a deficient number, since it is larger than the sum of its proper divisors (4303921831).

6564646425 is a wasteful number, since it uses less digits than its factorization.

6564646425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121137 (or 121132 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 48.

The square root of 6564646425 is about 81022.5056697212. The cubic root of 6564646425 is about 1872.4221926870.

The spelling of 6564646425 in words is "six billion, five hundred sixty-four million, six hundred forty-six thousand, four hundred twenty-five".