68721508305 has 96 divisors (see below), whose sum is σ = 127065189888. Its totient is φ = 34239283200.

The previous prime is 68721508267. The next prime is 68721508351. The reversal of 68721508305 is 50380512786.

It is not a de Polignac number, because 68721508305 - 2¹¹ = 68721506257 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 84736350 + ... + 84737160.

It is an arithmetic number, because the mean of its divisors is an integer number (1323595728).

Almost surely, 2^68721508305 is an apocalyptic number.

It is an amenable number.

68721508305 is a deficient number, since it is larger than the sum of its proper divisors (58343681583).

68721508305 is a wasteful number, since it uses less digits than its factorization.

68721508305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527 (or 1524 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 45.

The spelling of 68721508305 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred eight thousand, three hundred five".