2511256511 has 4 divisors (see below), whose sum is σ = 2513937552. Its totient is φ = 2508575472.

The previous prime is 2511256499. The next prime is 2511256513. The reversal of 2511256511 is 1156521152.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2511256511 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 (2511256513) 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, 1339115 + ... + 1340988.

It is an arithmetic number, because the mean of its divisors is an integer number (628484388).

Almost surely, 2^2511256511 is an apocalyptic number.

2511256511 is a deficient number, since it is larger than the sum of its proper divisors (2681041).

2511256511 is an equidigital number, since it uses as much as digits as its factorization.

2511256511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2681040.

The product of its digits is 3000, while the sum is 29.

The square root of 2511256511 is about 50112.4386854202. The cubic root of 2511256511 is about 1359.2427501172.

Adding to 2511256511 its reverse (1156521152), we get a palindrome (3667777663).

The spelling of 2511256511 in words is "two billion, five hundred eleven million, two hundred fifty-six thousand, five hundred eleven".