656020993 has 2 divisors, whose sum is σ = 656020994. Its totient is φ = 656020992.

The previous prime is 656020921. The next prime is 656021011. The reversal of 656020993 is 399020656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 653927184 + 2093809 = 25572^2 + 1447^2 .

It is a cyclic number.

It is not a de Polignac number, because 656020993 - 2¹³ = 656012801 is a prime.

It is not a weakly prime, because it can be changed into another prime (656020793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328010496 + 328010497.

It is an arithmetic number, because the mean of its divisors is an integer number (328010497).

Almost surely, 2^656020993 is an apocalyptic number.

It is an amenable number.

656020993 is a deficient number, since it is larger than the sum of its proper divisors (1).

656020993 is an equidigital number, since it uses as much as digits as its factorization.

656020993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 656020993 is about 25612.9067659257. The cubic root of 656020993 is about 868.9055657235.

The spelling of 656020993 in words is "six hundred fifty-six million, twenty thousand, nine hundred ninety-three".