2205401857 has 12 divisors (see below), whose sum is σ = 2344311396. Its totient is φ = 2067536640.

The previous prime is 2205401791. The next prime is 2205401911. The reversal of 2205401857 is 7581045022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1185493761 + 1019908096 = 34431^2 + 31936^2 .

It is not a de Polignac number, because 2205401857 - 2⁷ = 2205401729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2205401557) 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 11 ways as a sum of consecutive naturals, for example, 4232757 + ... + 4233277.

It is an arithmetic number, because the mean of its divisors is an integer number (195359283).

Almost surely, 2^2205401857 is an apocalyptic number.

It is an amenable number.

2205401857 is a deficient number, since it is larger than the sum of its proper divisors (138909539).

2205401857 is an frugal number, since it uses more digits than its factorization.

2205401857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 2205401857 is about 46961.7062828854. The cubic root of 2205401857 is about 1301.6550630090.

Adding to 2205401857 its reverse (7581045022), we get a palindrome (9786446879).

The spelling of 2205401857 in words is "two billion, two hundred five million, four hundred one thousand, eight hundred fifty-seven".