2556534310261 has 2 divisors, whose sum is σ = 2556534310262. Its totient is φ = 2556534310260.

The previous prime is 2556534310219. The next prime is 2556534310307. The reversal of 2556534310261 is 1620134356552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2422362283236 + 134172027025 = 1556394^2 + 366295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2556534310261 - 2⁷ = 2556534310133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2556534350261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1278267155130 + 1278267155131.

It is an arithmetic number, because the mean of its divisors is an integer number (1278267155131).

Almost surely, 2^{2556534310261} is an apocalyptic number.

It is an amenable number.

2556534310261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2556534310261 is an equidigital number, since it uses as much as digits as its factorization.

2556534310261 is an evil number, because the sum of its binary digits is even.

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

The spelling of 2556534310261 in words is "two trillion, five hundred fifty-six billion, five hundred thirty-four million, three hundred ten thousand, two hundred sixty-one".