12511111311 has 32 divisors (see below), whose sum is σ = 18979051520. Its totient is φ = 8141176512.

The previous prime is 12511111307. The next prime is 12511111343. The reversal of 12511111311 is 11311111521.

12511111311 is a `hidden beast` number, since 12 + 511 + 11 + 131 + 1 = 666.

It is not a de Polignac number, because 12511111311 - 2² = 12511111307 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 (12511111511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2311170 + ... + 2316576.

It is an arithmetic number, because the mean of its divisors is an integer number (593095360).

Almost surely, 2^12511111311 is an apocalyptic number.

12511111311 is a deficient number, since it is larger than the sum of its proper divisors (6467940209).

12511111311 is a wasteful number, since it uses less digits than its factorization.

12511111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7452 (or 7446 counting only the distinct ones).

The product of its digits is 30, while the sum is 18.

Adding to 12511111311 its reverse (11311111521), we get a palindrome (23822222832).

The spelling of 12511111311 in words is "twelve billion, five hundred eleven million, one hundred eleven thousand, three hundred eleven".