2178805745 has 8 divisors (see below), whose sum is σ = 2620028160. Its totient is φ = 1739403760.

The previous prime is 2178805711. The next prime is 2178805789. The reversal of 2178805745 is 5475088712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2178805745 - 2¹⁰ = 2178804721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2178805745.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 452471 + ... + 457260.

It is an arithmetic number, because the mean of its divisors is an integer number (327503520).

Almost surely, 2^2178805745 is an apocalyptic number.

It is an amenable number.

2178805745 is a deficient number, since it is larger than the sum of its proper divisors (441222415).

2178805745 is an equidigital number, since it uses as much as digits as its factorization.

2178805745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910215.

The product of its (nonzero) digits is 627200, while the sum is 47.

The square root of 2178805745 is about 46677.6793017819. The cubic root of 2178805745 is about 1296.4014374667.

The spelling of 2178805745 in words is "two billion, one hundred seventy-eight million, eight hundred five thousand, seven hundred forty-five".