68719345664 has 36 divisors (see below), whose sum is σ = 137438429184. Its totient is φ = 34359607296.

The previous prime is 68719345637. The next prime is 68719345679. The reversal of 68719345664 is 46654391786.

It is a nialpdrome in base 2, base 4, base 8 and base 16.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131072 + ... + 393215.

It is an arithmetic number, because the mean of its divisors is an integer number (3817734144).

Almost surely, 2^68719345664 is an apocalyptic number.

68719345664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68719345664 is a deficient number, since it is larger than the sum of its proper divisors (68719083520).

68719345664 is an frugal number, since it uses more digits than its factorization.

68719345664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524321 (or 524289 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 59.

The spelling of 68719345664 in words is "sixty-eight billion, seven hundred nineteen million, three hundred forty-five thousand, six hundred sixty-four".