656380447 has 2 divisors, whose sum is σ = 656380448. Its totient is φ = 656380446.

The previous prime is 656380411. The next prime is 656380493. The reversal of 656380447 is 744083656.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656380447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656380247) 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, 328190223 + 328190224.

It is an arithmetic number, because the mean of its divisors is an integer number (328190224).

Almost surely, 2^656380447 is an apocalyptic number.

656380447 is a deficient number, since it is larger than the sum of its proper divisors (1).

656380447 is an equidigital number, since it uses as much as digits as its factorization.

656380447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 656380447 is about 25619.9228531235. The cubic root of 656380447 is about 869.0642367399.

The spelling of 656380447 in words is "six hundred fifty-six million, three hundred eighty thousand, four hundred forty-seven".