11521612511 has 4 divisors (see below), whose sum is σ = 11789557032. Its totient is φ = 11253667992.

The previous prime is 11521612493. The next prime is 11521612607.

It is a happy number.

11521612511 is nontrivially palindromic in base 10.

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 11521612511 - 2¹⁴ = 11521596127 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 (11521912511) 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, 133972196 + ... + 133972281.

It is an arithmetic number, because the mean of its divisors is an integer number (2947389258).

Almost surely, 2^11521612511 is an apocalyptic number.

11521612511 is a deficient number, since it is larger than the sum of its proper divisors (267944521).

11521612511 is an equidigital number, since it uses as much as digits as its factorization.

11521612511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267944520.

The product of its digits is 600, while the sum is 26.

The spelling of 11521612511 in words is "eleven billion, five hundred twenty-one million, six hundred twelve thousand, five hundred eleven".