2605186845 has 24 divisors (see below), whose sum is σ = 4781285496. Its totient is φ = 1307701248.

The previous prime is 2605186823. The next prime is 2605186847. The reversal of 2605186845 is 5486815062.

It can be written as a sum of positive squares in 4 ways, for example, as 482373369 + 2122813476 = 21963^2 + 46074^2 .

It is not a de Polignac number, because 2605186845 - 2⁵ = 2605186813 is a prime.

It is a super-2 number, since 2×2605186845² = 13573996994722108050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2605186845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605186847) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1701972 + ... + 1703501.

It is an arithmetic number, because the mean of its divisors is an integer number (199220229).

Almost surely, 2^2605186845 is an apocalyptic number.

It is an amenable number.

2605186845 is a deficient number, since it is larger than the sum of its proper divisors (2176098651).

2605186845 is a wasteful number, since it uses less digits than its factorization.

2605186845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405501 (or 3405498 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The square root of 2605186845 is about 51041.0309946811. The cubic root of 2605186845 is about 1375.9826531652.

It can be divided in two parts, 26051 and 86845, that added together give a square (112896 = 336²).

The spelling of 2605186845 in words is "two billion, six hundred five million, one hundred eighty-six thousand, eight hundred forty-five".