68648821056 has 56 divisors (see below), whose sum is σ = 201814826240. Its totient is φ = 22882939776.

The previous prime is 68648821051. The next prime is 68648821063. The reversal of 68648821056 is 65012884686.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 68648820993 and 68648821011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68648821051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19861936 + ... + 19865391.

Almost surely, 2^68648821056 is an apocalyptic number.

It is an amenable number.

68648821056 is an abundant number, since it is smaller than the sum of its proper divisors (133166005184).

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

68648821056 is a wasteful number, since it uses less digits than its factorization.

68648821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39727348 (or 39727332 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 68648821056 in words is "sixty-eight billion, six hundred forty-eight million, eight hundred twenty-one thousand, fifty-six".