2178405485 has 4 divisors (see below), whose sum is σ = 2614086588. Its totient is φ = 1742724384.

The previous prime is 2178405469. The next prime is 2178405503. The reversal of 2178405485 is 5845048712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1464286756 + 714118729 = 38266^2 + 26723^2 .

It is a cyclic number.

It is not a de Polignac number, because 2178405485 - 2⁴ = 2178405469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217840544 + ... + 217840553.

It is an arithmetic number, because the mean of its divisors is an integer number (653521647).

Almost surely, 2^2178405485 is an apocalyptic number.

It is an amenable number.

2178405485 is a deficient number, since it is larger than the sum of its proper divisors (435681103).

2178405485 is an equidigital number, since it uses as much as digits as its factorization.

2178405485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435681102.

The product of its (nonzero) digits is 358400, while the sum is 44.

The square root of 2178405485 is about 46673.3916166374. The cubic root of 2178405485 is about 1296.3220469690.

The spelling of 2178405485 in words is "two billion, one hundred seventy-eight million, four hundred five thousand, four hundred eighty-five".