68391664324 has 27 divisors (see below), whose sum is σ = 120421233261. Its totient is φ = 33986879280.

The previous prime is 68391664273. The next prime is 68391664349. The reversal of 68391664324 is 42346619386.

The square root of 68391664324 is 261518.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 63696673924 + 4694990400 = 252382^2 + 68520^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 119774959 + ... + 119775529.

Almost surely, 2^68391664324 is an apocalyptic number.

68391664324 is the 261518-th square number.

It is an amenable number.

68391664324 is a deficient number, since it is larger than the sum of its proper divisors (52029568937).

68391664324 is an frugal number, since it uses more digits than its factorization.

68391664324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604 (or 802 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 52.

The spelling of 68391664324 in words is "sixty-eight billion, three hundred ninety-one million, six hundred sixty-four thousand, three hundred twenty-four".