647666343 has 12 divisors (see below), whose sum is σ = 936023400. Its totient is φ = 431544336.

The previous prime is 647666333. The next prime is 647666359. The reversal of 647666343 is 343666746.

It is not a de Polignac number, because 647666343 - 2⁵ = 647666311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647666333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 921 + ... + 36002.

It is an arithmetic number, because the mean of its divisors is an integer number (78001950).

Almost surely, 2^647666343 is an apocalyptic number.

647666343 is a deficient number, since it is larger than the sum of its proper divisors (288357057).

647666343 is a wasteful number, since it uses less digits than its factorization.

647666343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38878 (or 38875 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 45.

The square root of 647666343 is about 25449.2896364515. The cubic root of 647666343 is about 865.2011930234.

The spelling of 647666343 in words is "six hundred forty-seven million, six hundred sixty-six thousand, three hundred forty-three".