6564331967425 has 6 divisors (see below), whose sum is σ = 8139771639638. Its totient is φ = 5251465573920.

The previous prime is 6564331967411. The next prime is 6564331967429. The reversal of 6564331967425 is 5247691334656.

It can be written as a sum of positive squares in 3 ways, for example, as 1571109326721 + 4993222640704 = 1253439^2 + 2234552^2 .

It is not a de Polignac number, because 6564331967425 - 2⁵ = 6564331967393 is a prime.

It is a super-2 number, since 2×6564331967425² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6564331967429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131286639324 + ... + 131286639373.

Almost surely, 2^{6564331967425} is an apocalyptic number.

It is an amenable number.

6564331967425 is a deficient number, since it is larger than the sum of its proper divisors (1575439672213).

6564331967425 is a wasteful number, since it uses less digits than its factorization.

6564331967425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262573278707 (or 262573278702 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 61.

The spelling of 6564331967425 in words is "six trillion, five hundred sixty-four billion, three hundred thirty-one million, nine hundred sixty-seven thousand, four hundred twenty-five".