2556406611 has 24 divisors (see below), whose sum is σ = 4104290736. Its totient is φ = 1520101440.

The previous prime is 2556406597. The next prime is 2556406651. The reversal of 2556406611 is 1166046552.

2556406611 is a `hidden beast` number, since 2 + 5 + 5 + 640 + 6 + 6 + 1 + 1 = 666.

It is not a de Polignac number, because 2556406611 - 2²⁵ = 2522852179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2556406651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 238360 + ... + 248853.

It is an arithmetic number, because the mean of its divisors is an integer number (171012114).

Almost surely, 2^2556406611 is an apocalyptic number.

2556406611 is a deficient number, since it is larger than the sum of its proper divisors (1547884125).

2556406611 is a wasteful number, since it uses less digits than its factorization.

2556406611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487283 (or 487280 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2556406611 is about 50560.9197997821. The cubic root of 2556406611 is about 1367.3403942167.

The spelling of 2556406611 in words is "two billion, five hundred fifty-six million, four hundred six thousand, six hundred eleven".