647085643 has 2 divisors, whose sum is σ = 647085644. Its totient is φ = 647085642.

The previous prime is 647085623. The next prime is 647085683. The reversal of 647085643 is 346580746.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 647085643 - 2¹³ = 647077451 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647085643.

It is not a weakly prime, because it can be changed into another prime (647085623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323542821 + 323542822.

It is an arithmetic number, because the mean of its divisors is an integer number (323542822).

Almost surely, 2^647085643 is an apocalyptic number.

647085643 is a deficient number, since it is larger than the sum of its proper divisors (1).

647085643 is an equidigital number, since it uses as much as digits as its factorization.

647085643 is an evil number, because the sum of its binary digits is even.

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

The square root of 647085643 is about 25437.8781151259. The cubic root of 647085643 is about 864.9425348573.

The spelling of 647085643 in words is "six hundred forty-seven million, eighty-five thousand, six hundred forty-three".