2564655521 has 8 divisors (see below), whose sum is σ = 2579099424. Its totient is φ = 2550250080.

The previous prime is 2564655517. The next prime is 2564655523. The reversal of 2564655521 is 1255564652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2564655521 - 2² = 2564655517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564655523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129725 + ... + 148181.

It is an arithmetic number, because the mean of its divisors is an integer number (322387428).

Almost surely, 2^2564655521 is an apocalyptic number.

It is an amenable number.

2564655521 is a deficient number, since it is larger than the sum of its proper divisors (14443903).

2564655521 is a wasteful number, since it uses less digits than its factorization.

2564655521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19231.

The product of its digits is 360000, while the sum is 41.

The square root of 2564655521 is about 50642.4280717266. The cubic root of 2564655521 is about 1368.8095081792.

The spelling of 2564655521 in words is "two billion, five hundred sixty-four million, six hundred fifty-five thousand, five hundred twenty-one".