640650046652 has 144 divisors (see below), whose sum is σ = 1498422602880. Its totient is φ = 236340720000.

The previous prime is 640650046649. The next prime is 640650046657. The reversal of 640650046652 is 256640056046.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640650046657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116457902 + ... + 116463402.

It is an arithmetic number, because the mean of its divisors is an integer number (10405712520).

Almost surely, 2^640650046652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640650046652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (749211301440).

640650046652 is an abundant number, since it is smaller than the sum of its proper divisors (857772556228).

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

640650046652 is a wasteful number, since it uses less digits than its factorization.

640650046652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8392 (or 8383 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 44.

The spelling of 640650046652 in words is "six hundred forty billion, six hundred fifty million, forty-six thousand, six hundred fifty-two".