660726793 has 2 divisors, whose sum is σ = 660726794. Its totient is φ = 660726792.

The previous prime is 660726791. The next prime is 660726809. The reversal of 660726793 is 397627066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658076409 + 2650384 = 25653^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 660726793 - 2¹ = 660726791 is a prime.

Together with 660726791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (660726791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330363396 + 330363397.

It is an arithmetic number, because the mean of its divisors is an integer number (330363397).

Almost surely, 2^660726793 is an apocalyptic number.

It is an amenable number.

660726793 is a deficient number, since it is larger than the sum of its proper divisors (1).

660726793 is an equidigital number, since it uses as much as digits as its factorization.

660726793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 571536, while the sum is 46.

The square root of 660726793 is about 25704.6064548750. The cubic root of 660726793 is about 870.9782421299.

The spelling of 660726793 in words is "six hundred sixty million, seven hundred twenty-six thousand, seven hundred ninety-three".