68521643215444 has 12 divisors (see below), whose sum is σ = 121100131822068. Its totient is φ = 33921605552000.

The previous prime is 68521643215423. The next prime is 68521643215489. The reversal of 68521643215444 is 44451234612586.

It can be written as a sum of positive squares in 2 ways, for example, as 34335052790544 + 34186590424900 = 5859612^2 + 5846930^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84804013477 + ... + 84804014284.

It is an arithmetic number, because the mean of its divisors is an integer number (10091677651839).

Almost surely, 2^{68521643215444} is an apocalyptic number.

It is an amenable number.

68521643215444 is a deficient number, since it is larger than the sum of its proper divisors (52578488606624).

68521643215444 is a wasteful number, since it uses less digits than its factorization.

68521643215444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169608027866 (or 169608027864 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 55.

The spelling of 68521643215444 in words is "sixty-eight trillion, five hundred twenty-one billion, six hundred forty-three million, two hundred fifteen thousand, four hundred forty-four".