2564221560 has 32 divisors (see below), whose sum is σ = 7692665040. Its totient is φ = 683792384.

The previous prime is 2564221553. The next prime is 2564221573. The reversal of 2564221560 is 651224652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10684137 + ... + 10684376.

Almost surely, 2^2564221560 is an apocalyptic number.

2564221560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2564221560 is an abundant number, since it is smaller than the sum of its proper divisors (5128443480).

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

2564221560 is a wasteful number, since it uses less digits than its factorization.

2564221560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21368527 (or 21368523 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 2564221560 is about 50638.1433308924. The cubic root of 2564221560 is about 1368.7322991810.

The spelling of 2564221560 in words is "two billion, five hundred sixty-four million, two hundred twenty-one thousand, five hundred sixty".