68655762816 has 64 divisors (see below), whose sum is σ = 182717434800. Its totient is φ = 22841262080.

The previous prime is 68655762797. The next prime is 68655762829. The reversal of 68655762816 is 61826755686.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×68655762816² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68655762816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28480 + ... + 371648.

Almost surely, 2^68655762816 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 68655762816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91358717400).

68655762816 is an abundant number, since it is smaller than the sum of its proper divisors (114061671984).

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

68655762816 is a wasteful number, since it uses less digits than its factorization.

68655762816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343707 (or 343695 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 60.

The spelling of 68655762816 in words is "sixty-eight billion, six hundred fifty-five million, seven hundred sixty-two thousand, eight hundred sixteen".