65781386939 has 2 divisors, whose sum is σ = 65781386940. Its totient is φ = 65781386938.

The previous prime is 65781386927. The next prime is 65781386947. The reversal of 65781386939 is 93968318756.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65781386939 - 2²⁰ = 65780338363 is a prime.

It is not a weakly prime, because it can be changed into another prime (65781386039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32890693469 + 32890693470.

It is an arithmetic number, because the mean of its divisors is an integer number (32890693470).

Almost surely, 2^65781386939 is an apocalyptic number.

65781386939 is a deficient number, since it is larger than the sum of its proper divisors (1).

65781386939 is an equidigital number, since it uses as much as digits as its factorization.

65781386939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 65.

The spelling of 65781386939 in words is "sixty-five billion, seven hundred eighty-one million, three hundred eighty-six thousand, nine hundred thirty-nine".