68818604454 has 72 divisors (see below), whose sum is σ = 158514300360. Its totient is φ = 22130524080.

The previous prime is 68818604441. The next prime is 68818604501. The reversal of 68818604454 is 45440681886.

It is a happy number.

68818604454 is a `hidden beast` number, since 6 + 8 + 8 + 186 + 0 + 4 + 454 = 666.

It is a super-2 number, since 2×68818604454² (a number of 22 digits) contains 22 as substring.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 68818604454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 55904019 + ... + 55905249.

It is an arithmetic number, because the mean of its divisors is an integer number (2201587505).

Almost surely, 2^68818604454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68818604454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79257150180).

68818604454 is an abundant number, since it is smaller than the sum of its proper divisors (89695695906).

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

68818604454 is an equidigital number, since it uses as much as digits as its factorization.

68818604454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 5898240, while the sum is 54.

Multiplying 68818604454 by its sum of digits (54), we get a square (3716204640516 = 1927746²).

68818604454 divided by its sum of digits (54) gives a square (1274418601 = 35699²).

The spelling of 68818604454 in words is "sixty-eight billion, eight hundred eighteen million, six hundred four thousand, four hundred fifty-four".