656380247 has 2 divisors, whose sum is σ = 656380248. Its totient is φ = 656380246.

The previous prime is 656380237. The next prime is 656380273. The reversal of 656380247 is 742083656.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656380247 - 2⁸ = 656379991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656380237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328190123 + 328190124.

It is an arithmetic number, because the mean of its divisors is an integer number (328190124).

Almost surely, 2^656380247 is an apocalyptic number.

656380247 is a deficient number, since it is larger than the sum of its proper divisors (1).

656380247 is an equidigital number, since it uses as much as digits as its factorization.

656380247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 656380247 is about 25619.9189499108. The cubic root of 656380247 is about 869.0641484716.

The spelling of 656380247 in words is "six hundred fifty-six million, three hundred eighty thousand, two hundred forty-seven".