648565447 has 2 divisors, whose sum is σ = 648565448. Its totient is φ = 648565446.

The previous prime is 648565387. The next prime is 648565471. The reversal of 648565447 is 744565846.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-648565447 is a prime.

It is a super-3 number, since 3×648565447³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 648565447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (648560447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324282723 + 324282724.

It is an arithmetic number, because the mean of its divisors is an integer number (324282724).

Almost surely, 2^648565447 is an apocalyptic number.

648565447 is a deficient number, since it is larger than the sum of its proper divisors (1).

648565447 is an equidigital number, since it uses as much as digits as its factorization.

648565447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 49.

The square root of 648565447 is about 25466.9481288984. The cubic root of 648565447 is about 865.6013713821.

The spelling of 648565447 in words is "six hundred forty-eight million, five hundred sixty-five thousand, four hundred forty-seven".