68201577909 has 10 divisors (see below), whose sum is σ = 101881369590. Its totient is φ = 45467718552.

The previous prime is 68201577881. The next prime is 68201577953. The reversal of 68201577909 is 90977510286.

68201577909 is a `hidden beast` number, since 68 + 2 + 0 + 1 + 577 + 9 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64917944100 + 3283633809 = 254790^2 + 57303^2 .

It is not a de Polignac number, because 68201577909 - 2⁷ = 68201577781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68201577809) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 420997314 + ... + 420997475.

It is an arithmetic number, because the mean of its divisors is an integer number (10188136959).

Almost surely, 2^68201577909 is an apocalyptic number.

It is an amenable number.

68201577909 is a deficient number, since it is larger than the sum of its proper divisors (33679791681).

68201577909 is an equidigital number, since it uses as much as digits as its factorization.

68201577909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841994801 (or 841994792 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 68201577909 in words is "sixty-eight billion, two hundred one million, five hundred seventy-seven thousand, nine hundred nine".