68565620650 has 48 divisors (see below), whose sum is σ = 128616118488. Its totient is φ = 27194112000.

The previous prime is 68565620639. The next prime is 68565620659. The reversal of 68565620650 is 5602656586.

It can be written as a sum of positive squares in 12 ways, for example, as 1832781721 + 66732838929 = 42811^2 + 258327^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68565620594 and 68565620603.

It is not an unprimeable number, because it can be changed into a prime (68565620659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2795440 + ... + 2819860.

Almost surely, 2^68565620650 is an apocalyptic number.

68565620650 is a deficient number, since it is larger than the sum of its proper divisors (60050497838).

68565620650 is a wasteful number, since it uses less digits than its factorization.

68565620650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24907 (or 24902 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 68565620650 in words is "sixty-eight billion, five hundred sixty-five million, six hundred twenty thousand, six hundred fifty".