643677290496 has 400 divisors, whose sum is σ = 2009740788000. Its totient is φ = 204919013376.

The previous prime is 643677290467. The next prime is 643677290507. The reversal of 643677290496 is 694092776346.

643677290496 is a `hidden beast` number, since 6 + 436 + 7 + 72 + 90 + 49 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 976748215 + ... + 976748873.

It is an arithmetic number, because the mean of its divisors is an integer number (5024351970).

Almost surely, 2^643677290496 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 643677290496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1004870394000).

643677290496 is an abundant number, since it is smaller than the sum of its proper divisors (1366063497504).

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

643677290496 is an frugal number, since it uses more digits than its factorization.

643677290496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 82301184, while the sum is 63.

The spelling of 643677290496 in words is "six hundred forty-three billion, six hundred seventy-seven million, two hundred ninety thousand, four hundred ninety-six".