11818200693121 has 3 divisors (see below), whose sum is σ = 11818204130883. Its totient is φ = 11818197255360.

The previous prime is 11818200693023. The next prime is 11818200693149. The reversal of 11818200693121 is 12139600281811.

The square root of 11818200693121 is 3437761.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8404427123521 + 3413773569600 = 2899039^2 + 1847640^2 .

It is not a de Polignac number, because 11818200693121 - 2⁷ = 11818200692993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11818200693161) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1718881 + ... + 5156641.

It is an arithmetic number, because the mean of its divisors is an integer number (3939401376961).

Almost surely, 2^{11818200693121} is an apocalyptic number.

11818200693121 is the 3437761-st square number.

11818200693121 is the 1718881-st centered octagonal number.

It is an amenable number.

11818200693121 is a deficient number, since it is larger than the sum of its proper divisors (3437762).

11818200693121 is an frugal number, since it uses more digits than its factorization.

11818200693121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875522 (or 3437761 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The spelling of 11818200693121 in words is "eleven trillion, eight hundred eighteen billion, two hundred million, six hundred ninety-three thousand, one hundred twenty-one".