68910745664 has 56 divisors (see below), whose sum is σ = 139363691808. Its totient is φ = 33799772160.

The previous prime is 68910745637. The next prime is 68910745667. The reversal of 68910745664 is 46654701986.

It is not an unprimeable number, because it can be changed into a prime (68910745667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1000067 + ... + 1066749.

Almost surely, 2^68910745664 is an apocalyptic number.

68910745664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68910745664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69681845904).

68910745664 is an abundant number, since it is smaller than the sum of its proper divisors (70452946144).

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

68910745664 is a wasteful number, since it uses less digits than its factorization.

68910745664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67003 (or 66993 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 68910745664 in words is "sixty-eight billion, nine hundred ten million, seven hundred forty-five thousand, six hundred sixty-four".