647036739664 has 40 divisors (see below), whose sum is σ = 1433252978240. Its totient is φ = 277199117568.

The previous prime is 647036739649. The next prime is 647036739691. The reversal of 647036739664 is 466937630746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760854 + ... + 1368565.

It is an arithmetic number, because the mean of its divisors is an integer number (35831324456).

Almost surely, 2^647036739664 is an apocalyptic number.

It is an amenable number.

647036739664 is an abundant number, since it is smaller than the sum of its proper divisors (786216238576).

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

647036739664 is a wasteful number, since it uses less digits than its factorization.

647036739664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2132147 (or 2132141 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 61.

The spelling of 647036739664 in words is "six hundred forty-seven billion, thirty-six million, seven hundred thirty-nine thousand, six hundred sixty-four".