68931665280 has 256 divisors, whose sum is σ = 258494846400. Its totient is φ = 17300422656.

The previous prime is 68931665273. The next prime is 68931665339. The reversal of 68931665280 is 8256613986.

It is a happy number.

68931665280 is a `hidden beast` number, since 6 + 89 + 31 + 6 + 6 + 528 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176434 + ... + 411086.

Almost surely, 2^68931665280 is an apocalyptic number.

68931665280 is a gapful number since it is divisible by the number (60) 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 68931665280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129247423200).

68931665280 is an abundant number, since it is smaller than the sum of its proper divisors (189563181120).

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

68931665280 is a wasteful number, since it uses less digits than its factorization.

68931665280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234698 (or 234680 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 68931665280 in words is "sixty-eight billion, nine hundred thirty-one million, six hundred sixty-five thousand, two hundred eighty".