11521661153 has 8 divisors (see below), whose sum is σ = 11645612136. Its totient is φ = 11397904000.

The previous prime is 11521661089. The next prime is 11521661167. The reversal of 11521661153 is 35116612511.

It can be written as a sum of positive squares in 4 ways, for example, as 5027235409 + 6494425744 = 70903^2 + 80588^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11521661153 - 2⁶ = 11521661089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11521661183) 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 7 ways as a sum of consecutive naturals, for example, 72683 + ... + 168303.

It is an arithmetic number, because the mean of its divisors is an integer number (1455701517).

Almost surely, 2^11521661153 is an apocalyptic number.

It is an amenable number.

11521661153 is a deficient number, since it is larger than the sum of its proper divisors (123950983).

11521661153 is a wasteful number, since it uses less digits than its factorization.

11521661153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96915.

The product of its digits is 5400, while the sum is 32.

The spelling of 11521661153 in words is "eleven billion, five hundred twenty-one million, six hundred sixty-one thousand, one hundred fifty-three".