11619855989897 has 2 divisors, whose sum is σ = 11619855989898. Its totient is φ = 11619855989896.

The previous prime is 11619855989867. The next prime is 11619855989927. The reversal of 11619855989897 is 79898955891611.

11619855989897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (11619855989867) and next prime (11619855989927).

It can be written as a sum of positive squares in only one way, i.e., 7013921921161 + 4605934068736 = 2648381^2 + 2146144^2 .

It is a cyclic number.

It is not a de Polignac number, because 11619855989897 - 2¹⁶ = 11619855924361 is a prime.

It is not a weakly prime, because it can be changed into another prime (11619855989827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5809927994948 + 5809927994949.

It is an arithmetic number, because the mean of its divisors is an integer number (5809927994949).

Almost surely, 2^{11619855989897} is an apocalyptic number.

It is an amenable number.

11619855989897 is a deficient number, since it is larger than the sum of its proper divisors (1).

11619855989897 is an equidigital number, since it uses as much as digits as its factorization.

11619855989897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3527193600, while the sum is 86.

The spelling of 11619855989897 in words is "eleven trillion, six hundred nineteen billion, eight hundred fifty-five million, nine hundred eighty-nine thousand, eight hundred ninety-seven".