11181900649 has 16 divisors (see below), whose sum is σ = 11729765520. Its totient is φ = 10645841920.

The previous prime is 11181900623. The next prime is 11181900659. The reversal of 11181900649 is 94600918111.

It can be written as a sum of positive squares in 8 ways, for example, as 129163225 + 11052737424 = 11365^2 + 105132^2 .

It is a cyclic number.

It is not a de Polignac number, because 11181900649 - 2¹⁵ = 11181867881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11181900659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 636909 + ... + 654229.

It is an arithmetic number, because the mean of its divisors is an integer number (733110345).

Almost surely, 2^11181900649 is an apocalyptic number.

It is an amenable number.

11181900649 is a deficient number, since it is larger than the sum of its proper divisors (547864871).

11181900649 is a wasteful number, since it uses less digits than its factorization.

11181900649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17660.

The product of its (nonzero) digits is 15552, while the sum is 40.

The spelling of 11181900649 in words is "eleven billion, one hundred eighty-one million, nine hundred thousand, six hundred forty-nine".