647687798783 has 16 divisors (see below), whose sum is σ = 677258539200. Its totient is φ = 618610540800.

The previous prime is 647687798753. The next prime is 647687798801. The reversal of 647687798783 is 387897786746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647687798783 - 2³⁴ = 630507929599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647687798698 and 647687798707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647687798713) 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, 3208910 + ... + 3404772.

It is an arithmetic number, because the mean of its divisors is an integer number (42328658700).

Almost surely, 2^647687798783 is an apocalyptic number.

647687798783 is a deficient number, since it is larger than the sum of its proper divisors (29570740417).

647687798783 is a wasteful number, since it uses less digits than its factorization.

647687798783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197122.

The product of its digits is 4779565056, while the sum is 80.

The spelling of 647687798783 in words is "six hundred forty-seven billion, six hundred eighty-seven million, seven hundred ninety-eight thousand, seven hundred eighty-three".