642633163056 has 120 divisors (see below), whose sum is σ = 1907456709600. Its totient is φ = 201273366528.

The previous prime is 642633163043. The next prime is 642633163087. The reversal of 642633163056 is 650361336246.

642633163056 is a `hidden beast` number, since 6 + 4 + 2 + 6 + 3 + 3 + 1 + 630 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1247226 + ... + 1685478.

It is an arithmetic number, because the mean of its divisors is an integer number (15895472580).

Almost surely, 2^642633163056 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 642633163056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (953728354800).

642633163056 is an abundant number, since it is smaller than the sum of its proper divisors (1264823546544).

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

642633163056 is a wasteful number, since it uses less digits than its factorization.

642633163056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438883 (or 438874 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 45.

The spelling of 642633163056 in words is "six hundred forty-two billion, six hundred thirty-three million, one hundred sixty-three thousand, fifty-six".