11564531671 has 32 divisors (see below), whose sum is σ = 14769216000. Its totient is φ = 8797098240.

The previous prime is 11564531663. The next prime is 11564531711. The reversal of 11564531671 is 17613546511.

It is not a de Polignac number, because 11564531671 - 2³ = 11564531663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11564531071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6121095 + ... + 6122983.

It is an arithmetic number, because the mean of its divisors is an integer number (461538000).

Almost surely, 2^11564531671 is an apocalyptic number.

11564531671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11564531671 is a deficient number, since it is larger than the sum of its proper divisors (3204684329).

11564531671 is an frugal number, since it uses more digits than its factorization.

11564531671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036 (or 1950 counting only the distinct ones).

The product of its digits is 75600, while the sum is 40.

The spelling of 11564531671 in words is "eleven billion, five hundred sixty-four million, five hundred thirty-one thousand, six hundred seventy-one".