2545617666 has 64 divisors (see below), whose sum is σ = 5332594176. Its totient is φ = 809452800.

The previous prime is 2545617661. The next prime is 2545617671. The reversal of 2545617666 is 6667165452.

It is an interprime number because it is at equal distance from previous prime (2545617661) and next prime (2545617671).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2545617661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2704756 + ... + 2705696.

It is an arithmetic number, because the mean of its divisors is an integer number (83321784).

Almost surely, 2^2545617666 is an apocalyptic number.

2545617666 is an abundant number, since it is smaller than the sum of its proper divisors (2786976510).

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

2545617666 is a wasteful number, since it uses less digits than its factorization.

2545617666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1227.

The product of its digits is 1814400, while the sum is 48.

The square root of 2545617666 is about 50454.1144605670. The cubic root of 2545617666 is about 1365.4141275888.

The spelling of 2545617666 in words is "two billion, five hundred forty-five million, six hundred seventeen thousand, six hundred sixty-six".