65767759891 has 2 divisors, whose sum is σ = 65767759892. Its totient is φ = 65767759890.

The previous prime is 65767759873. The next prime is 65767759951. The reversal of 65767759891 is 19895776756.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65767759891 - 2¹⁷ = 65767628819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65767759891.

It is not a weakly prime, because it can be changed into another prime (65767759861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32883879945 + 32883879946.

It is an arithmetic number, because the mean of its divisors is an integer number (32883879946).

Almost surely, 2^65767759891 is an apocalyptic number.

65767759891 is a deficient number, since it is larger than the sum of its proper divisors (1).

65767759891 is an equidigital number, since it uses as much as digits as its factorization.

65767759891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 200037600, while the sum is 70.

The spelling of 65767759891 in words is "sixty-five billion, seven hundred sixty-seven million, seven hundred fifty-nine thousand, eight hundred ninety-one".