11561366205 has 96 divisors (see below), whose sum is σ = 22082471424. Its totient is φ = 5571790848.

The previous prime is 11561366203. The next prime is 11561366237. The reversal of 11561366205 is 50266316511.

11561366205 is a `hidden beast` number, since 1 + 1 + 561 + 36 + 62 + 0 + 5 = 666.

It is not a de Polignac number, because 11561366205 - 2¹ = 11561366203 is a prime.

It is a super-2 number, since 2×11561366205² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11561366205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11561366203) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1902582 + ... + 1908648.

It is an arithmetic number, because the mean of its divisors is an integer number (230025744).

Almost surely, 2^11561366205 is an apocalyptic number.

11561366205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11561366205 is a deficient number, since it is larger than the sum of its proper divisors (10521105219).

11561366205 is a wasteful number, since it uses less digits than its factorization.

11561366205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6195 (or 6192 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 11561366205 in words is "eleven billion, five hundred sixty-one million, three hundred sixty-six thousand, two hundred five".