65640990043 has 2 divisors, whose sum is σ = 65640990044. Its totient is φ = 65640990042.

The previous prime is 65640990017. The next prime is 65640990049. The reversal of 65640990043 is 34009904656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65640990043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 65640989975 and 65640990002.

It is not a weakly prime, because it can be changed into another prime (65640990049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32820495021 + 32820495022.

It is an arithmetic number, because the mean of its divisors is an integer number (32820495022).

Almost surely, 2^65640990043 is an apocalyptic number.

65640990043 is a deficient number, since it is larger than the sum of its proper divisors (1).

65640990043 is an equidigital number, since it uses as much as digits as its factorization.

65640990043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 65640990043 in words is "sixty-five billion, six hundred forty million, nine hundred ninety thousand, forty-three".