65881618867 has 2 divisors, whose sum is σ = 65881618868. Its totient is φ = 65881618866.

The previous prime is 65881618771. The next prime is 65881618871. The reversal of 65881618867 is 76881618856.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65881618867 - 2¹⁹ = 65881094579 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65881618799 and 65881618808.

It is not a weakly prime, because it can be changed into another prime (65881618877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32940809433 + 32940809434.

It is an arithmetic number, because the mean of its divisors is an integer number (32940809434).

Almost surely, 2^65881618867 is an apocalyptic number.

65881618867 is a deficient number, since it is larger than the sum of its proper divisors (1).

65881618867 is an equidigital number, since it uses as much as digits as its factorization.

65881618867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30965760, while the sum is 64.

The spelling of 65881618867 in words is "sixty-five billion, eight hundred eighty-one million, six hundred eighteen thousand, eight hundred sixty-seven".