647663566336 has 40 divisors (see below), whose sum is σ = 1298196869904. Its totient is φ = 322797096960.

The previous prime is 647663566321. The next prime is 647663566357. The reversal of 647663566336 is 633665366746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1860460 + ... + 2180971.

Almost surely, 2^647663566336 is an apocalyptic number.

It is an amenable number.

647663566336 is an abundant number, since it is smaller than the sum of its proper divisors (650533303568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

647663566336 is an equidigital number, since it uses as much as digits as its factorization.

647663566336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4041762 (or 4041746 counting only the distinct ones).

The product of its digits is 176359680, while the sum is 61.

The spelling of 647663566336 in words is "six hundred forty-seven billion, six hundred sixty-three million, five hundred sixty-six thousand, three hundred thirty-six".