2556346651 has 2 divisors, whose sum is σ = 2556346652. Its totient is φ = 2556346650.

The previous prime is 2556346649. The next prime is 2556346711. The reversal of 2556346651 is 1566436552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2556346651 - 2¹ = 2556346649 is a prime.

Together with 2556346649, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2556346598 and 2556346607.

It is not a weakly prime, because it can be changed into another prime (2556346601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278173325 + 1278173326.

It is an arithmetic number, because the mean of its divisors is an integer number (1278173326).

Almost surely, 2^2556346651 is an apocalyptic number.

2556346651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556346651 is an equidigital number, since it uses as much as digits as its factorization.

2556346651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 43.

The square root of 2556346651 is about 50560.3268482315. The cubic root of 2556346651 is about 1367.3297039023.

The spelling of 2556346651 in words is "two billion, five hundred fifty-six million, three hundred forty-six thousand, six hundred fifty-one".