65685947407 has 2 divisors, whose sum is σ = 65685947408. Its totient is φ = 65685947406.

The previous prime is 65685947381. The next prime is 65685947507. The reversal of 65685947407 is 70474958656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65685947407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65685947507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32842973703 + 32842973704.

It is an arithmetic number, because the mean of its divisors is an integer number (32842973704).

Almost surely, 2^65685947407 is an apocalyptic number.

65685947407 is a deficient number, since it is larger than the sum of its proper divisors (1).

65685947407 is an equidigital number, since it uses as much as digits as its factorization.

65685947407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50803200, while the sum is 61.

The spelling of 65685947407 in words is "sixty-five billion, six hundred eighty-five million, nine hundred forty-seven thousand, four hundred seven".