68221546740 has 36 divisors (see below), whose sum is σ = 206938692324. Its totient is φ = 18192412416.

The previous prime is 68221546733. The next prime is 68221546751. The reversal of 68221546740 is 4764512286.

68221546740 is a `hidden beast` number, since 6 + 82 + 21 + 546 + 7 + 4 + 0 = 666.

68221546740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 31186853604 + 37034693136 = 176598^2 + 192444^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189504117 + ... + 189504476.

It is an arithmetic number, because the mean of its divisors is an integer number (5748297009).

Almost surely, 2^68221546740 is an apocalyptic number.

68221546740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68221546740 is an abundant number, since it is smaller than the sum of its proper divisors (138717145584).

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

68221546740 is a wasteful number, since it uses less digits than its factorization.

68221546740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379008608 (or 379008603 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

It can be divided in two parts, 68221546 and 740, that added together give a palindrome (68222286).

The spelling of 68221546740 in words is "sixty-eight billion, two hundred twenty-one million, five hundred forty-six thousand, seven hundred forty".