647312646909 has 16 divisors (see below), whose sum is σ = 875962212800. Its totient is φ = 425116688256.

The previous prime is 647312646853. The next prime is 647312646917. The reversal of 647312646909 is 909646213746.

It is a happy number.

It is not a de Polignac number, because 647312646909 - 2⁷ = 647312646781 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 (647312647909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1601179 + ... + 1964280.

It is an arithmetic number, because the mean of its divisors is an integer number (54747638300).

Almost surely, 2^647312646909 is an apocalyptic number.

It is an amenable number.

647312646909 is a deficient number, since it is larger than the sum of its proper divisors (228649565891).

647312646909 is a wasteful number, since it uses less digits than its factorization.

647312646909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566364.

The product of its (nonzero) digits is 11757312, while the sum is 57.

The spelling of 647312646909 in words is "six hundred forty-seven billion, three hundred twelve million, six hundred forty-six thousand, nine hundred nine".