2185356645 has 32 divisors (see below), whose sum is σ = 3895584000. Its totient is φ = 1162372032.

The previous prime is 2185356643. The next prime is 2185356653. The reversal of 2185356645 is 5466535812.

2185356645 is a `hidden beast` number, since 2 + 1 + 85 + 3 + 566 + 4 + 5 = 666.

It is not a de Polignac number, because 2185356645 - 2¹ = 2185356643 is a prime.

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 2185356645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185356643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28656 + ... + 72054.

It is an arithmetic number, because the mean of its divisors is an integer number (121737000).

Almost surely, 2^2185356645 is an apocalyptic number.

It is an amenable number.

2185356645 is a deficient number, since it is larger than the sum of its proper divisors (1710227355).

2185356645 is a wasteful number, since it uses less digits than its factorization.

2185356645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43786 (or 43780 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The square root of 2185356645 is about 46747.7982904008. The cubic root of 2185356645 is about 1297.6994113639.

The spelling of 2185356645 in words is "two billion, one hundred eighty-five million, three hundred fifty-six thousand, six hundred forty-five".