68481650644 has 12 divisors (see below), whose sum is σ = 130737696768. Its totient is φ = 31128023000.

The previous prime is 68481650639. The next prime is 68481650669. The reversal of 68481650644 is 44605618486.

It is a happy number.

It is a super-2 number, since 2×68481650644² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 68481650591 and 68481650600.

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, 778200532 + ... + 778200619.

It is an arithmetic number, because the mean of its divisors is an integer number (10894808064).

Almost surely, 2^68481650644 is an apocalyptic number.

It is an amenable number.

68481650644 is a deficient number, since it is larger than the sum of its proper divisors (62256046124).

68481650644 is a wasteful number, since it uses less digits than its factorization.

68481650644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1556401166 (or 1556401164 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 68481650644 in words is "sixty-eight billion, four hundred eighty-one million, six hundred fifty thousand, six hundred forty-four".