65640793943 has 2 divisors, whose sum is σ = 65640793944. Its totient is φ = 65640793942.

The previous prime is 65640793921. The next prime is 65640793961. The reversal of 65640793943 is 34939704656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65640793943 - 2¹⁶ = 65640728407 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65640793963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820396971 + 32820396972.

It is an arithmetic number, because the mean of its divisors is an integer number (32820396972).

Almost surely, 2^65640793943 is an apocalyptic number.

65640793943 is a deficient number, since it is larger than the sum of its proper divisors (1).

65640793943 is an equidigital number, since it uses as much as digits as its factorization.

65640793943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 65640793943 in words is "sixty-five billion, six hundred forty million, seven hundred ninety-three thousand, nine hundred forty-three".