2545561617 has 16 divisors (see below), whose sum is σ = 3418835520. Its totient is φ = 1684694592.

The previous prime is 2545561609. The next prime is 2545561637. The reversal of 2545561617 is 7161655452.

It is not a de Polignac number, because 2545561617 - 2³ = 2545561609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2545561637) 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, 380223 + ... + 386859.

It is an arithmetic number, because the mean of its divisors is an integer number (213677220).

Almost surely, 2^2545561617 is an apocalyptic number.

It is an amenable number.

2545561617 is a deficient number, since it is larger than the sum of its proper divisors (873273903).

2545561617 is a wasteful number, since it uses less digits than its factorization.

2545561617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552.

The product of its digits is 252000, while the sum is 42.

The square root of 2545561617 is about 50453.5590122243. The cubic root of 2545561617 is about 1365.4041063591.

The spelling of 2545561617 in words is "two billion, five hundred forty-five million, five hundred sixty-one thousand, six hundred seventeen".