11818195771 has 2 divisors, whose sum is σ = 11818195772. Its totient is φ = 11818195770.

The previous prime is 11818195769. The next prime is 11818195793. The reversal of 11818195771 is 17759181811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11818195771 - 2¹ = 11818195769 is a prime.

It is a super-3 number, since 3×11818195771³ (a number of 31 digits) contains 333 as substring.

Together with 11818195769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11818196771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5909097885 + 5909097886.

It is an arithmetic number, because the mean of its divisors is an integer number (5909097886).

Almost surely, 2^11818195771 is an apocalyptic number.

11818195771 is a deficient number, since it is larger than the sum of its proper divisors (1).

11818195771 is an equidigital number, since it uses as much as digits as its factorization.

11818195771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 49.

The spelling of 11818195771 in words is "eleven billion, eight hundred eighteen million, one hundred ninety-five thousand, seven hundred seventy-one".