646620807294 has 576 divisors, whose sum is σ = 1857161779200. Its totient is φ = 162341625600.

The previous prime is 646620807271. The next prime is 646620807317. The reversal of 646620807294 is 492708026646.

646620807294 is a `hidden beast` number, since 6 + 4 + 6 + 620 + 8 + 0 + 7 + 2 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (646620807271) and next prime (646620807317).

It is a self number, because there is not a number n which added to its sum of digits gives 646620807294.

It is a congruent number.

It is an unprimeable number.

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 287 ways as a sum of consecutive naturals, for example, 3871980799 + ... + 3871980965.

It is an arithmetic number, because the mean of its divisors is an integer number (3224239200).

Almost surely, 2^646620807294 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646620807294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (928580889600).

646620807294 is an abundant number, since it is smaller than the sum of its proper divisors (1210540971906).

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

646620807294 is a wasteful number, since it uses less digits than its factorization.

646620807294 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 54.

The spelling of 646620807294 in words is "six hundred forty-six billion, six hundred twenty million, eight hundred seven thousand, two hundred ninety-four".