65778687739 has 2 divisors, whose sum is σ = 65778687740. Its totient is φ = 65778687738.

The previous prime is 65778687703. The next prime is 65778687769. The reversal of 65778687739 is 93778687756.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65778687739 - 2¹⁵ = 65778654971 is a prime.

It is not a weakly prime, because it can be changed into another prime (65778687769) 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, 32889343869 + 32889343870.

It is an arithmetic number, because the mean of its divisors is an integer number (32889343870).

Almost surely, 2^65778687739 is an apocalyptic number.

65778687739 is a deficient number, since it is larger than the sum of its proper divisors (1).

65778687739 is an equidigital number, since it uses as much as digits as its factorization.

65778687739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746807040, while the sum is 73.

The spelling of 65778687739 in words is "sixty-five billion, seven hundred seventy-eight million, six hundred eighty-seven thousand, seven hundred thirty-nine".