647991406050 has 48 divisors (see below), whose sum is σ = 1607097933792. Its totient is φ = 172789187200.

The previous prime is 647991406031. The next prime is 647991406063. The reversal of 647991406050 is 50604199746.

It is a junction number, because it is equal to n+sod(n) for n = 647991405984 and 647991406002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3309385 + ... + 3499715.

It is an arithmetic number, because the mean of its divisors is an integer number (33481206954).

Almost surely, 2^647991406050 is an apocalyptic number.

647991406050 is an abundant number, since it is smaller than the sum of its proper divisors (959106527742).

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

647991406050 is a wasteful number, since it uses less digits than its factorization.

647991406050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213043 (or 213038 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 51.

The spelling of 647991406050 in words is "six hundred forty-seven billion, nine hundred ninety-one million, four hundred six thousand, fifty".