65401818191 has 2 divisors, whose sum is σ = 65401818192. Its totient is φ = 65401818190.

The previous prime is 65401818151. The next prime is 65401818211. The reversal of 65401818191 is 19181810456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65401818191 - 2⁶ = 65401818127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65401818101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32700909095 + 32700909096.

It is an arithmetic number, because the mean of its divisors is an integer number (32700909096).

Almost surely, 2^65401818191 is an apocalyptic number.

65401818191 is a deficient number, since it is larger than the sum of its proper divisors (1).

65401818191 is an equidigital number, since it uses as much as digits as its factorization.

65401818191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 44.

The spelling of 65401818191 in words is "sixty-five billion, four hundred one million, eight hundred eighteen thousand, one hundred ninety-one".