11664156533 has 4 divisors (see below), whose sum is σ = 11667534060. Its totient is φ = 11660779008.

The previous prime is 11664156473. The next prime is 11664156557. The reversal of 11664156533 is 33565146611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33565146611 = 127 ⋅264292493.

It can be written as a sum of positive squares in 2 ways, for example, as 4547209489 + 7116947044 = 67433^2 + 84362^2 .

It is a cyclic number.

It is not a de Polignac number, because 11664156533 - 2⁸ = 11664156277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11664153533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683578 + ... + 1690491.

It is an arithmetic number, because the mean of its divisors is an integer number (2916883515).

Almost surely, 2^11664156533 is an apocalyptic number.

It is an amenable number.

11664156533 is a deficient number, since it is larger than the sum of its proper divisors (3377527).

11664156533 is an equidigital number, since it uses as much as digits as its factorization.

11664156533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3377526.

The product of its digits is 194400, while the sum is 41.

The spelling of 11664156533 in words is "eleven billion, six hundred sixty-four million, one hundred fifty-six thousand, five hundred thirty-three".