647682647653 has 4 divisors (see below), whose sum is σ = 649221086668. Its totient is φ = 646144208640.

The previous prime is 647682647621. The next prime is 647682647659. The reversal of 647682647653 is 356746286746.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 45284691204 + 602397956449 = 212802^2 + 776143^2 .

It is a cyclic number.

It is not a de Polignac number, because 647682647653 - 2⁵ = 647682647621 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 (647682647659) 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, 769218876 + ... + 769219717.

It is an arithmetic number, because the mean of its divisors is an integer number (162305271667).

Almost surely, 2^647682647653 is an apocalyptic number.

It is an amenable number.

647682647653 is a deficient number, since it is larger than the sum of its proper divisors (1538439015).

647682647653 is a wasteful number, since it uses less digits than its factorization.

647682647653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538439014.

The product of its digits is 243855360, while the sum is 64.

The spelling of 647682647653 in words is "six hundred forty-seven billion, six hundred eighty-two million, six hundred forty-seven thousand, six hundred fifty-three".