11564646511 has 6 divisors (see below), whose sum is σ = 12711553736. Its totient is φ = 10513314900.

The previous prime is 11564646451. The next prime is 11564646521.

11564646511 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 11564646511 - 2¹⁷ = 11564515439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11564646521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47787675 + ... + 47787916.

Almost surely, 2^11564646511 is an apocalyptic number.

11564646511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11564646511 is a deficient number, since it is larger than the sum of its proper divisors (1146907225).

11564646511 is an equidigital number, since it uses as much as digits as its factorization.

11564646511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95575613 (or 95575602 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The spelling of 11564646511 in words is "eleven billion, five hundred sixty-four million, six hundred forty-six thousand, five hundred eleven".