2545564561 has 8 divisors (see below), whose sum is σ = 2598233760.
Its totient is φ = 2493430368.
The previous prime is 2545564529. The next prime is 2545564579. The reversal of 2545564561 is 1654655452.
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 2545564561 - 25 = 2545564529 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (2545564061) 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, 124131 + ... + 143176.
It is an arithmetic number, because the mean of its divisors is an integer number (324779220).
Almost surely, 22545564561 is an apocalyptic number.
It is an amenable number.
2545564561 is a deficient number, since it is larger than the sum of its proper divisors (52669199).
2545564561 is a wasteful number, since it uses less digits than its factorization.
2545564561 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 267503.
The product of its digits is 720000, while the sum is 43.
The square root of 2545564561 is about 50453.5881875611.
The cubic root of 2545564561 is about 1365.4046327325.
The spelling of 2545564561 in words is "two billion, five hundred forty-five million, five hundred sixty-four thousand, five hundred sixty-one".