65666326651 has 2 divisors, whose sum is σ = 65666326652. Its totient is φ = 65666326650.

The previous prime is 65666326603. The next prime is 65666326657. The reversal of 65666326651 is 15662366656.

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-65666326651 is a prime.

It is not a weakly prime, because it can be changed into another prime (65666326657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32833163325 + 32833163326.

It is an arithmetic number, because the mean of its divisors is an integer number (32833163326).

Almost surely, 2^65666326651 is an apocalyptic number.

65666326651 is a deficient number, since it is larger than the sum of its proper divisors (1).

65666326651 is an equidigital number, since it uses as much as digits as its factorization.

65666326651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 52.

The spelling of 65666326651 in words is "sixty-five billion, six hundred sixty-six million, three hundred twenty-six thousand, six hundred fifty-one".