11553666537 has 32 divisors (see below), whose sum is σ = 18026668800. Its totient is φ = 6579390720.

The previous prime is 11553666511. The next prime is 11553666559. The reversal of 11553666537 is 73566635511.

It is not a de Polignac number, because 11553666537 - 2¹⁶ = 11553601001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11553666587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 282337 + ... + 320657.

It is an arithmetic number, because the mean of its divisors is an integer number (563333400).

Almost surely, 2^11553666537 is an apocalyptic number.

It is an amenable number.

11553666537 is a deficient number, since it is larger than the sum of its proper divisors (6473002263).

11553666537 is an equidigital number, since it uses as much as digits as its factorization.

11553666537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38638 (or 38624 counting only the distinct ones).

The product of its digits is 1701000, while the sum is 48.

The spelling of 11553666537 in words is "eleven billion, five hundred fifty-three million, six hundred sixty-six thousand, five hundred thirty-seven".