11550206405 has 4 divisors (see below), whose sum is σ = 13860247692. Its totient is φ = 9240165120.

The previous prime is 11550206377. The next prime is 11550206407. The reversal of 11550206405 is 50460205511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50460205511 = 17 ⋅2968247383.

It can be written as a sum of positive squares in 2 ways, for example, as 3776962849 + 7773243556 = 61457^2 + 88166^2 .

It is not a de Polignac number, because 11550206405 - 2¹² = 11550202309 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 (11550206407) 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, 1155020636 + ... + 1155020645.

It is an arithmetic number, because the mean of its divisors is an integer number (3465061923).

Almost surely, 2^11550206405 is an apocalyptic number.

It is an amenable number.

11550206405 is a deficient number, since it is larger than the sum of its proper divisors (2310041287).

11550206405 is an equidigital number, since it uses as much as digits as its factorization.

11550206405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310041286.

The product of its (nonzero) digits is 6000, while the sum is 29.

The spelling of 11550206405 in words is "eleven billion, five hundred fifty million, two hundred six thousand, four hundred five".