647336663 has 4 divisors (see below), whose sum is σ = 662391048. Its totient is φ = 632282280.

The previous prime is 647336621. The next prime is 647336689. The reversal of 647336663 is 366633746.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 647336663 - 2¹⁴ = 647320279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647336603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7527128 + ... + 7527213.

It is an arithmetic number, because the mean of its divisors is an integer number (165597762).

Almost surely, 2^647336663 is an apocalyptic number.

647336663 is a deficient number, since it is larger than the sum of its proper divisors (15054385).

647336663 is a wasteful number, since it uses less digits than its factorization.

647336663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15054384.

The product of its digits is 979776, while the sum is 44.

The square root of 647336663 is about 25442.8116174294. The cubic root of 647336663 is about 865.0543643647.

The spelling of 647336663 in words is "six hundred forty-seven million, three hundred thirty-six thousand, six hundred sixty-three".