65881618771 has 2 divisors, whose sum is σ = 65881618772. Its totient is φ = 65881618770.

The previous prime is 65881618657. The next prime is 65881618867. The reversal of 65881618771 is 17781618856.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65881618771 - 2⁹ = 65881618259 is a prime.

It is not a weakly prime, because it can be changed into another prime (65881618171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32940809385 + 32940809386.

It is an arithmetic number, because the mean of its divisors is an integer number (32940809386).

Almost surely, 2^65881618771 is an apocalyptic number.

65881618771 is a deficient number, since it is larger than the sum of its proper divisors (1).

65881618771 is an equidigital number, since it uses as much as digits as its factorization.

65881618771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 58.

The spelling of 65881618771 in words is "sixty-five billion, eight hundred eighty-one million, six hundred eighteen thousand, seven hundred seventy-one".