2178750645 has 12 divisors (see below), whose sum is σ = 3776501196. Its totient is φ = 1162000320.

The previous prime is 2178750631. The next prime is 2178750671. The reversal of 2178750645 is 5460578712.

2178750645 is a `hidden beast` number, since 21 + 7 + 87 + 506 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 808492356 + 1370258289 = 28434^2 + 37017^2 .

It is not a de Polignac number, because 2178750645 - 2⁸ = 2178750389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 48416681 = 2178750645 / (2 + 1 + 7 + 8 + 7 + 5 + 0 + 6 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 2178750645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24208296 + ... + 24208385.

It is an arithmetic number, because the mean of its divisors is an integer number (314708433).

Almost surely, 2^2178750645 is an apocalyptic number.

It is an amenable number.

2178750645 is a deficient number, since it is larger than the sum of its proper divisors (1597750551).

2178750645 is a wasteful number, since it uses less digits than its factorization.

2178750645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48416692 (or 48416689 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 45.

The square root of 2178750645 is about 46677.0890801901. The cubic root of 2178750645 is about 1296.3905091066.

The spelling of 2178750645 in words is "two billion, one hundred seventy-eight million, seven hundred fifty thousand, six hundred forty-five".