2556261511 has 4 divisors (see below), whose sum is σ = 2556423000. Its totient is φ = 2556100024.

The previous prime is 2556261451. The next prime is 2556261529. The reversal of 2556261511 is 1151626552.

2556261511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2556261511 - 2²³ = 2547872903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556261571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54061 + ... + 89638.

It is an arithmetic number, because the mean of its divisors is an integer number (639105750).

Almost surely, 2^2556261511 is an apocalyptic number.

2556261511 is a deficient number, since it is larger than the sum of its proper divisors (161489).

2556261511 is a wasteful number, since it uses less digits than its factorization.

2556261511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161488.

The product of its digits is 18000, while the sum is 34.

The square root of 2556261511 is about 50559.4848767271. The cubic root of 2556261511 is about 1367.3145239392.

The spelling of 2556261511 in words is "two billion, five hundred fifty-six million, two hundred sixty-one thousand, five hundred eleven".