68143817344 has 64 divisors (see below), whose sum is σ = 136847637000. Its totient is φ = 33798369280.

The previous prime is 68143817239. The next prime is 68143817363. The reversal of 68143817344 is 44371834186.

It can be written as a sum of positive squares in 4 ways, for example, as 27304257600 + 40839559744 = 165240^2 + 202088^2 .

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

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, 17944854 + ... + 17948650.

Almost surely, 2^68143817344 is an apocalyptic number.

68143817344 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 68143817344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68423818500).

68143817344 is an abundant number, since it is smaller than the sum of its proper divisors (68703819656).

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

68143817344 is a wasteful number, since it uses less digits than its factorization.

68143817344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4901 (or 4889 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 49.

The spelling of 68143817344 in words is "sixty-eight billion, one hundred forty-three million, eight hundred seventeen thousand, three hundred forty-four".