11666021243633 has 4 divisors (see below), whose sum is σ = 11711414322660. Its totient is φ = 11620628164608.

The previous prime is 11666021243629. The next prime is 11666021243743. The reversal of 11666021243633 is 33634212066611.

11666021243633 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11106176103649 + 559845139984 = 3332593^2 + 748228^2 .

It is a cyclic number.

It is not a de Polignac number, because 11666021243633 - 2² = 11666021243629 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11666021248633) 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, 22696539128 + ... + 22696539641.

It is an arithmetic number, because the mean of its divisors is an integer number (2927853580665).

Almost surely, 2^{11666021243633} is an apocalyptic number.

It is an amenable number.

11666021243633 is a deficient number, since it is larger than the sum of its proper divisors (45393079027).

11666021243633 is an equidigital number, since it uses as much as digits as its factorization.

11666021243633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45393079026.

The product of its (nonzero) digits is 559872, while the sum is 44.

The spelling of 11666021243633 in words is "eleven trillion, six hundred sixty-six billion, twenty-one million, two hundred forty-three thousand, six hundred thirty-three".