68178661720 has 128 divisors (see below), whose sum is σ = 172600243200. Its totient is φ = 24049073664.

The previous prime is 68178661703. The next prime is 68178661729. The reversal of 68178661720 is 2716687186.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68178661729) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10988139 + ... + 10994341.

It is an arithmetic number, because the mean of its divisors is an integer number (1348439400).

Almost surely, 2^68178661720 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 68178661720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86300121600).

68178661720 is an abundant number, since it is smaller than the sum of its proper divisors (104421581480).

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

68178661720 is a wasteful number, since it uses less digits than its factorization.

68178661720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7169 (or 7165 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 68178661720 in words is "sixty-eight billion, one hundred seventy-eight million, six hundred sixty-one thousand, seven hundred twenty".