2566406756 has 6 divisors (see below), whose sum is σ = 4491211830. Its totient is φ = 1283203376.

The previous prime is 2566406671. The next prime is 2566406803. The reversal of 2566406756 is 6576046652.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2556920356 + 9486400 = 50566^2 + 3080^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2566406756.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 320800841 + ... + 320800848.

It is an arithmetic number, because the mean of its divisors is an integer number (748535305).

Almost surely, 2^2566406756 is an apocalyptic number.

It is an amenable number.

2566406756 is a deficient number, since it is larger than the sum of its proper divisors (1924805074).

2566406756 is a wasteful number, since it uses less digits than its factorization.

2566406756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641601693 (or 641601691 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 47.

The square root of 2566406756 is about 50659.7153170051. The cubic root of 2566406756 is about 1369.1209940294.

The spelling of 2566406756 in words is "two billion, five hundred sixty-six million, four hundred six thousand, seven hundred fifty-six".