2566606861 has 32 divisors (see below), whose sum is σ = 3258768128. Its totient is φ = 1967016960.

The previous prime is 2566606853. The next prime is 2566606871. The reversal of 2566606861 is 1686066652.

It is a cyclic number.

It is not a de Polignac number, because 2566606861 - 2³ = 2566606853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566606871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809866 + ... + 813028.

It is an arithmetic number, because the mean of its divisors is an integer number (101836504).

Almost surely, 2^2566606861 is an apocalyptic number.

It is an amenable number.

2566606861 is a deficient number, since it is larger than the sum of its proper divisors (692161267).

2566606861 is a wasteful number, since it uses less digits than its factorization.

2566606861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461.

The product of its (nonzero) digits is 622080, while the sum is 46.

The square root of 2566606861 is about 50661.6902698676. The cubic root of 2566606861 is about 1369.1565769621.

The spelling of 2566606861 in words is "two billion, five hundred sixty-six million, six hundred six thousand, eight hundred sixty-one".