647666233 has 2 divisors, whose sum is σ = 647666234. Its totient is φ = 647666232.

The previous prime is 647666209. The next prime is 647666263. The reversal of 647666233 is 332666746.

647666233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635191209 + 12475024 = 25203^2 + 3532^2 .

It is a cyclic number.

It is not a de Polignac number, because 647666233 - 2⁹ = 647665721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 647666233.

It is not a weakly prime, because it can be changed into another prime (647666203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323833116 + 323833117.

It is an arithmetic number, because the mean of its divisors is an integer number (323833117).

Almost surely, 2^647666233 is an apocalyptic number.

It is an amenable number.

647666233 is a deficient number, since it is larger than the sum of its proper divisors (1).

647666233 is an equidigital number, since it uses as much as digits as its factorization.

647666233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 43.

The square root of 647666233 is about 25449.2874752909. The cubic root of 647666233 is about 865.2011440413.

The spelling of 647666233 in words is "six hundred forty-seven million, six hundred sixty-six thousand, two hundred thirty-three".