11556716715551 has 4 divisors (see below), whose sum is σ = 13207676246352. Its totient is φ = 9905757184752.

The previous prime is 11556716715527. The next prime is 11556716715623. The reversal of 11556716715551 is 15551761765511.

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-11556716715551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556716714551) 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, 825479765390 + ... + 825479765403.

It is an arithmetic number, because the mean of its divisors is an integer number (3301919061588).

Almost surely, 2^{11556716715551} is an apocalyptic number.

11556716715551 is a deficient number, since it is larger than the sum of its proper divisors (1650959530801).

11556716715551 is an equidigital number, since it uses as much as digits as its factorization.

11556716715551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650959530800.

The product of its digits is 5512500, while the sum is 56.

The spelling of 11556716715551 in words is "eleven trillion, five hundred fifty-six billion, seven hundred sixteen million, seven hundred fifteen thousand, five hundred fifty-one".