646614890496 has 192 divisors, whose sum is σ = 1916566797600. Its totient is φ = 215410212864.

The previous prime is 646614890491. The next prime is 646614890497. The reversal of 646614890496 is 694098416646.

646614890496 is a `hidden beast` number, since 6 + 4 + 6 + 61 + 4 + 89 + 0 + 496 = 666.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-4 number, since 4×646614890496⁴ (a number of 48 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646614890491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157978626 + ... + 157982718.

Almost surely, 2^646614890496 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 646614890496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (958283398800).

646614890496 is an abundant number, since it is smaller than the sum of its proper divisors (1269951907104).

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

646614890496 is a wasteful number, since it uses less digits than its factorization.

646614890496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981 (or 6955 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 63.

The spelling of 646614890496 in words is "six hundred forty-six billion, six hundred fourteen million, eight hundred ninety thousand, four hundred ninety-six".