11444816591 has 16 divisors (see below), whose sum is σ = 12364746240. Its totient is φ = 10530609120.

The previous prime is 11444816587. The next prime is 11444816599. The reversal of 11444816591 is 19561844411.

It is a cyclic number.

It is not a de Polignac number, because 11444816591 - 2² = 11444816587 is a prime.

It is a super-2 number, since 2×11444816591² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11444816599) 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, 8676230 + ... + 8677548.

It is an arithmetic number, because the mean of its divisors is an integer number (772796640).

Almost surely, 2^11444816591 is an apocalyptic number.

11444816591 is a deficient number, since it is larger than the sum of its proper divisors (919929649).

11444816591 is a wasteful number, since it uses less digits than its factorization.

11444816591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966.

The product of its digits is 138240, while the sum is 44.

The spelling of 11444816591 in words is "eleven billion, four hundred forty-four million, eight hundred sixteen thousand, five hundred ninety-one".