65720006663723 has 2 divisors, whose sum is σ = 65720006663724. Its totient is φ = 65720006663722.

The previous prime is 65720006663671. The next prime is 65720006663767. The reversal of 65720006663723 is 32736660002756.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65720006663723 is a prime.

It is not a weakly prime, because it can be changed into another prime (65720006660723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32860003331861 + 32860003331862.

It is an arithmetic number, because the mean of its divisors is an integer number (32860003331862).

Almost surely, 2^{65720006663723} is an apocalyptic number.

65720006663723 is a deficient number, since it is larger than the sum of its proper divisors (1).

65720006663723 is an equidigital number, since it uses as much as digits as its factorization.

65720006663723 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11430720, while the sum is 53.

The spelling of 65720006663723 in words is "sixty-five trillion, seven hundred twenty billion, six million, six hundred sixty-three thousand, seven hundred twenty-three".