2556656405123 has 8 divisors (see below), whose sum is σ = 2557965651792. Its totient is φ = 2555347376736.

The previous prime is 2556656405117. The next prime is 2556656405137. The reversal of 2556656405123 is 3215046566552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2556656405123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2556656465123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26654336 + ... + 26750082.

It is an arithmetic number, because the mean of its divisors is an integer number (319745706474).

Almost surely, 2^{2556656405123} is an apocalyptic number.

2556656405123 is a deficient number, since it is larger than the sum of its proper divisors (1309246669).

2556656405123 is a wasteful number, since it uses less digits than its factorization.

2556656405123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109141.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 2556656405123 in words is "two trillion, five hundred fifty-six billion, six hundred fifty-six million, four hundred five thousand, one hundred twenty-three".