68438417650 has 12 divisors (see below), whose sum is σ = 127295456922. Its totient is φ = 27375367040.

The previous prime is 68438417627. The next prime is 68438417689. The reversal of 68438417650 is 5671483486.

It can be written as a sum of positive squares in 3 ways, for example, as 51491324889 + 16947092761 = 226917^2 + 130181^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 684384127 + ... + 684384226.

Almost surely, 2^68438417650 is an apocalyptic number.

68438417650 is a deficient number, since it is larger than the sum of its proper divisors (58857039272).

68438417650 is a wasteful number, since it uses less digits than its factorization.

68438417650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368768365 (or 1368768360 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 68438417650 in words is "sixty-eight billion, four hundred thirty-eight million, four hundred seventeen thousand, six hundred fifty".