647021664426 has 16 divisors (see below), whose sum is σ = 1294580082528. Its totient is φ = 215584429200.

The previous prime is 647021664403. The next prime is 647021664437. The reversal of 647021664426 is 624466120746.

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, 22349065 + ... + 22377996.

It is an arithmetic number, because the mean of its divisors is an integer number (80911255158).

Almost surely, 2^647021664426 is an apocalyptic number.

647021664426 is an abundant number, since it is smaller than the sum of its proper divisors (647558418102).

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

647021664426 is a wasteful number, since it uses less digits than its factorization.

647021664426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44729477.

The product of its (nonzero) digits is 2322432, while the sum is 48.

The spelling of 647021664426 in words is "six hundred forty-seven billion, twenty-one million, six hundred sixty-four thousand, four hundred twenty-six".