10991564011 has 16 divisors (see below), whose sum is σ = 11949143040. Its totient is φ = 10072222560.

The previous prime is 10991564009. The next prime is 10991564057. The reversal of 10991564011 is 11046519901.

It is a cyclic number.

It is not a de Polignac number, because 10991564011 - 2¹ = 10991564009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10991564611) 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, 1812861 + ... + 1818913.

It is an arithmetic number, because the mean of its divisors is an integer number (746821440).

Almost surely, 2^10991564011 is an apocalyptic number.

10991564011 is a deficient number, since it is larger than the sum of its proper divisors (957579029).

10991564011 is a wasteful number, since it uses less digits than its factorization.

10991564011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9186.

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 10991564011 in words is "ten billion, nine hundred ninety-one million, five hundred sixty-four thousand, eleven".