68667386544 has 240 divisors, whose sum is σ = 219981322080. Its totient is φ = 19856793600.

The previous prime is 68667386539. The next prime is 68667386549. The reversal of 68667386544 is 44568376686.

68667386544 is a `hidden beast` number, since 6 + 8 + 6 + 6 + 7 + 3 + 86 + 544 = 666.

It is an interprime number because it is at equal distance from previous prime (68667386539) and next prime (68667386549).

It is a super-2 number, since 2×68667386544² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68667386549) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1700994 + ... + 1740894.

It is an arithmetic number, because the mean of its divisors is an integer number (916588842).

Almost surely, 2^68667386544 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 68667386544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109990661040).

68667386544 is an abundant number, since it is smaller than the sum of its proper divisors (151313935536).

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

68667386544 is a wasteful number, since it uses less digits than its factorization.

68667386544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39988 (or 39979 counting only the distinct ones).

The product of its digits is 139345920, while the sum is 63.

The spelling of 68667386544 in words is "sixty-eight billion, six hundred sixty-seven million, three hundred eighty-six thousand, five hundred forty-four".