642793563648 has 400 divisors, whose sum is σ = 2030595747840. Its totient is φ = 201877401600.

The previous prime is 642793563631. The next prime is 642793563673. The reversal of 642793563648 is 846365397246.

642793563648 is a `hidden beast` number, since 6 + 4 + 2 + 7 + 9 + 3 + 563 + 64 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 150499753 + ... + 150504023.

Almost surely, 2^642793563648 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 642793563648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015297873920).

642793563648 is an abundant number, since it is smaller than the sum of its proper divisors (1387802184192).

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

642793563648 is a wasteful number, since it uses less digits than its factorization.

642793563648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511 (or 4486 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 63.

The spelling of 642793563648 in words is "six hundred forty-two billion, seven hundred ninety-three million, five hundred sixty-three thousand, six hundred forty-eight".