647373681243 has 64 divisors (see below), whose sum is σ = 1033799760000. Its totient is φ = 398931996672.

The previous prime is 647373681211. The next prime is 647373681271. The reversal of 647373681243 is 342186373746.

647373681243 is a `hidden beast` number, since 6 + 4 + 7 + 37 + 368 + 1 + 243 = 666.

It is not a de Polignac number, because 647373681243 - 2⁵ = 647373681211 is a prime.

It is a super-2 number, since 2×647373681243² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 647373681243.

It is not an unprimeable number, because it can be changed into a prime (647373681043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6033621 + ... + 6139977.

It is an arithmetic number, because the mean of its divisors is an integer number (16153121250).

Almost surely, 2^647373681243 is an apocalyptic number.

647373681243 is a deficient number, since it is larger than the sum of its proper divisors (386426078757).

647373681243 is a wasteful number, since it uses less digits than its factorization.

647373681243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106621 (or 106615 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 54.

The spelling of 647373681243 in words is "six hundred forty-seven billion, three hundred seventy-three million, six hundred eighty-one thousand, two hundred forty-three".