23111406511 has 4 divisors (see below), whose sum is σ = 23111817192. Its totient is φ = 23110995832.

The previous prime is 23111406463. The next prime is 23111406529. The reversal of 23111406511 is 11560411132.

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 23111406511 - 2¹⁵ = 23111373743 is a prime.

It is a super-2 number, since 2×23111406511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23111406541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104380 + ... + 238993.

It is an arithmetic number, because the mean of its divisors is an integer number (5777954298).

Almost surely, 2^23111406511 is an apocalyptic number.

23111406511 is a deficient number, since it is larger than the sum of its proper divisors (410681).

23111406511 is an equidigital number, since it uses as much as digits as its factorization.

23111406511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410680.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 23111406511 its reverse (11560411132), we get a palindrome (34671817643).

The spelling of 23111406511 in words is "twenty-three billion, one hundred eleven million, four hundred six thousand, five hundred eleven".