2555661646 has 16 divisors (see below), whose sum is σ = 4065300576. Its totient is φ = 1200795136.

The previous prime is 2555661623. The next prime is 2555661649. The reversal of 2555661646 is 6461665552.

It is a junction number, because it is equal to n+sod(n) for n = 2555661596 and 2555661605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555661649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36091 + ... + 80086.

It is an arithmetic number, because the mean of its divisors is an integer number (254081286).

Almost surely, 2^2555661646 is an apocalyptic number.

2555661646 is a deficient number, since it is larger than the sum of its proper divisors (1509638930).

2555661646 is a wasteful number, since it uses less digits than its factorization.

2555661646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116843.

The product of its digits is 1296000, while the sum is 46.

The square root of 2555661646 is about 50553.5522589659. The cubic root of 2555661646 is about 1367.2075619703.

The spelling of 2555661646 in words is "two billion, five hundred fifty-five million, six hundred sixty-one thousand, six hundred forty-six".