647380585949 has 16 divisors (see below), whose sum is σ = 686204673840. Its totient is φ = 609663936000.

The previous prime is 647380585939. The next prime is 647380585981. The reversal of 647380585949 is 949585083746.

It can be written as a sum of positive squares in 8 ways, for example, as 25798141924 + 621582444025 = 160618^2 + 788405^2 .

It is a cyclic number.

It is not a de Polignac number, because 647380585949 - 2⁴ = 647380585933 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 (647380585939) 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, 5002439 + ... + 5130219.

It is an arithmetic number, because the mean of its divisors is an integer number (42887792115).

Almost surely, 2^647380585949 is an apocalyptic number.

It is an amenable number.

647380585949 is a deficient number, since it is larger than the sum of its proper divisors (38824087891).

647380585949 is a wasteful number, since it uses less digits than its factorization.

647380585949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132112.

The product of its (nonzero) digits is 261273600, while the sum is 68.

The spelling of 647380585949 in words is "six hundred forty-seven billion, three hundred eighty million, five hundred eighty-five thousand, nine hundred forty-nine".