11813544493 has 2 divisors, whose sum is σ = 11813544494. Its totient is φ = 11813544492.

The previous prime is 11813544451. The next prime is 11813544503. The reversal of 11813544493 is 39444531811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10970048644 + 843495849 = 104738^2 + 29043^2 .

It is a cyclic number.

It is not a de Polignac number, because 11813544493 - 2¹⁷ = 11813413421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11813544403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5906772246 + 5906772247.

It is an arithmetic number, because the mean of its divisors is an integer number (5906772247).

Almost surely, 2^11813544493 is an apocalyptic number.

It is an amenable number.

11813544493 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813544493 is an equidigital number, since it uses as much as digits as its factorization.

11813544493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The spelling of 11813544493 in words is "eleven billion, eight hundred thirteen million, five hundred forty-four thousand, four hundred ninety-three".