647666798807 has 16 divisors (see below), whose sum is σ = 780947516160. Its totient is φ = 524710265472.

The previous prime is 647666798791. The next prime is 647666798837. The reversal of 647666798807 is 708897666746.

It is a cyclic number.

It is not a de Polignac number, because 647666798807 - 2⁴ = 647666798791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647666798837) 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, 5565593 + ... + 5680770.

It is an arithmetic number, because the mean of its divisors is an integer number (48809219760).

Almost surely, 2^647666798807 is an apocalyptic number.

647666798807 is a deficient number, since it is larger than the sum of its proper divisors (133280717353).

647666798807 is a wasteful number, since it uses less digits than its factorization.

647666798807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11246822.

The product of its (nonzero) digits is 1024192512, while the sum is 74.

The spelling of 647666798807 in words is "six hundred forty-seven billion, six hundred sixty-six million, seven hundred ninety-eight thousand, eight hundred seven".