68220865651 has 4 divisors (see below), whose sum is σ = 68718828312. Its totient is φ = 67722902992.

The previous prime is 68220865633. The next prime is 68220865679. The reversal of 68220865651 is 15656802286.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68220865651 - 2⁷ = 68220865523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68220865595 and 68220865604.

It is not an unprimeable number, because it can be changed into a prime (68220865351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248981125 + ... + 248981398.

It is an arithmetic number, because the mean of its divisors is an integer number (17179707078).

Almost surely, 2^68220865651 is an apocalyptic number.

68220865651 is a deficient number, since it is larger than the sum of its proper divisors (497962661).

68220865651 is a wasteful number, since it uses less digits than its factorization.

68220865651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497962660.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 68220865651 in words is "sixty-eight billion, two hundred twenty million, eight hundred sixty-five thousand, six hundred fifty-one".