11555055511 has 8 divisors (see below), whose sum is σ = 11666054160. Its totient is φ = 11444112768.

The previous prime is 11555055497. The next prime is 11555055559.

11555055511 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11555055511 is a prime.

It is a super-2 number, since 2×11555055511² (a number of 21 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 (11555055581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486705 + ... + 509893.

It is an arithmetic number, because the mean of its divisors is an integer number (1458256770).

Almost surely, 2^11555055511 is an apocalyptic number.

11555055511 is a deficient number, since it is larger than the sum of its proper divisors (110998649).

11555055511 is a wasteful number, since it uses less digits than its factorization.

11555055511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27953.

The product of its (nonzero) digits is 15625, while the sum is 34.

The spelling of 11555055511 in words is "eleven billion, five hundred fifty-five million, fifty-five thousand, five hundred eleven".