68121577644 has 24 divisors (see below), whose sum is σ = 159274089408. Its totient is φ = 22660943760.

The previous prime is 68121577637. The next prime is 68121577663. The reversal of 68121577644 is 44677512186.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5774962 + ... + 5786745.

It is an arithmetic number, because the mean of its divisors is an integer number (6636420392).

Almost surely, 2^68121577644 is an apocalyptic number.

It is an amenable number.

68121577644 is an abundant number, since it is smaller than the sum of its proper divisors (91152511764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68121577644 is a wasteful number, since it uses less digits than its factorization.

68121577644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11562205 (or 11562203 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The spelling of 68121577644 in words is "sixty-eight billion, one hundred twenty-one million, five hundred seventy-seven thousand, six hundred forty-four".