68513236121 has 16 divisors (see below), whose sum is σ = 77257420800. Its totient is φ = 60193789200.

The previous prime is 68513236117. The next prime is 68513236153. The reversal of 68513236121 is 12163231586.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68513236121 - 2² = 68513236117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68513236621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116060 + ... + 387938.

It is an arithmetic number, because the mean of its divisors is an integer number (4828588800).

Almost surely, 2^68513236121 is an apocalyptic number.

It is an amenable number.

68513236121 is a deficient number, since it is larger than the sum of its proper divisors (8744184679).

68513236121 is a wasteful number, since it uses less digits than its factorization.

68513236121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272660.

The product of its digits is 51840, while the sum is 38.

The spelling of 68513236121 in words is "sixty-eight billion, five hundred thirteen million, two hundred thirty-six thousand, one hundred twenty-one".