68385855621 has 16 divisors (see below), whose sum is σ = 96288791040. Its totient is φ = 43052177520.

The previous prime is 68385855607. The next prime is 68385855677. The reversal of 68385855621 is 12655858386.

It is not a de Polignac number, because 68385855621 - 2⁵ = 68385855589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68385855721) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 1911135 + ... + 1946588.

It is an arithmetic number, because the mean of its divisors is an integer number (6018049440).

Almost surely, 2^68385855621 is an apocalyptic number.

It is an amenable number.

68385855621 is a deficient number, since it is larger than the sum of its proper divisors (27902935419).

68385855621 is a wasteful number, since it uses less digits than its factorization.

68385855621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3858056.

The product of its digits is 13824000, while the sum is 57.

The spelling of 68385855621 in words is "sixty-eight billion, three hundred eighty-five million, eight hundred fifty-five thousand, six hundred twenty-one".