2564721133 has 16 divisors (see below), whose sum is σ = 2939373360. Its totient is φ = 2216825856.

The previous prime is 2564721113. The next prime is 2564721161. The reversal of 2564721133 is 3311274652.

It can be written as a sum of positive squares in 8 ways, for example, as 16793604 + 2547927529 = 4098^2 + 50477^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564721133 - 2⁵ = 2564721101 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 (2564721113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14083 + ... + 72991.

It is an arithmetic number, because the mean of its divisors is an integer number (183710835).

Almost surely, 2^2564721133 is an apocalyptic number.

It is an amenable number.

2564721133 is a deficient number, since it is larger than the sum of its proper divisors (374652227).

2564721133 is a wasteful number, since it uses less digits than its factorization.

2564721133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59136.

The product of its digits is 30240, while the sum is 34.

The square root of 2564721133 is about 50643.0758643272. The cubic root of 2564721133 is about 1368.8211809052.

Adding to 2564721133 its reverse (3311274652), we get a palindrome (5875995785).

The spelling of 2564721133 in words is "two billion, five hundred sixty-four million, seven hundred twenty-one thousand, one hundred thirty-three".