646601802738 has 16 divisors (see below), whose sum is σ = 1293628898016. Its totient is φ = 215463052160.

The previous prime is 646601802731. The next prime is 646601802851. The reversal of 646601802738 is 837208106646.

It is not an unprimeable number, because it can be changed into a prime (646601802731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17700756 + ... + 17737247.

It is an arithmetic number, because the mean of its divisors is an integer number (80851806126).

Almost surely, 2^646601802738 is an apocalyptic number.

646601802738 is an abundant number, since it is smaller than the sum of its proper divisors (647027095278).

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

646601802738 is a wasteful number, since it uses less digits than its factorization.

646601802738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35441049.

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 646601802738 in words is "six hundred forty-six billion, six hundred one million, eight hundred two thousand, seven hundred thirty-eight".