11556366461 has 4 divisors (see below), whose sum is σ = 11577728124. Its totient is φ = 11535004800.

The previous prime is 11556366443. The next prime is 11556366517. The reversal of 11556366461 is 16466365511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6933726361 + 4622640100 = 83269^2 + 67990^2 .

It is a cyclic number.

It is not a de Polignac number, because 11556366461 - 2³⁰ = 10482624637 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 (11556366421) 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, 10680020 + ... + 10681101.

It is an arithmetic number, because the mean of its divisors is an integer number (2894432031).

Almost surely, 2^11556366461 is an apocalyptic number.

It is an amenable number.

11556366461 is a deficient number, since it is larger than the sum of its proper divisors (21361663).

11556366461 is an equidigital number, since it uses as much as digits as its factorization.

11556366461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21361662.

The product of its digits is 388800, while the sum is 44.

The spelling of 11556366461 in words is "eleven billion, five hundred fifty-six million, three hundred sixty-six thousand, four hundred sixty-one".