2565860221 has 8 divisors (see below), whose sum is σ = 2615315040. Its totient is φ = 2516444112.

The previous prime is 2565860191. The next prime is 2565860233. The reversal of 2565860221 is 1220685652.

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 2565860221 - 2⁷ = 2565860093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565860621) 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, 148870 + ... + 165208.

It is an arithmetic number, because the mean of its divisors is an integer number (326914380).

Almost surely, 2^2565860221 is an apocalyptic number.

It is an amenable number.

2565860221 is a deficient number, since it is larger than the sum of its proper divisors (49454819).

2565860221 is a wasteful number, since it uses less digits than its factorization.

2565860221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19355.

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 2565860221 is about 50654.3208522235. The cubic root of 2565860221 is about 1369.0237990357.

The spelling of 2565860221 in words is "two billion, five hundred sixty-five million, eight hundred sixty thousand, two hundred twenty-one".