68121500281 has 8 divisors (see below), whose sum is σ = 71815117824. Its totient is φ = 64521392160.

The previous prime is 68121500263. The next prime is 68121500297. The reversal of 68121500281 is 18200512186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68121500281 - 2²⁷ = 67987282553 is a prime.

It is a super-2 number, since 2×68121500281² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68121500231) 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 7 ways as a sum of consecutive naturals, for example, 23375860 + ... + 23378773.

It is an arithmetic number, because the mean of its divisors is an integer number (8976889728).

Almost surely, 2^68121500281 is an apocalyptic number.

68121500281 is the 165072-nd centered pentagonal number.

It is an amenable number.

68121500281 is a deficient number, since it is larger than the sum of its proper divisors (3693617543).

68121500281 is a wasteful number, since it uses less digits than its factorization.

68121500281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46754711.

The product of its (nonzero) digits is 7680, while the sum is 34.

The spelling of 68121500281 in words is "sixty-eight billion, one hundred twenty-one million, five hundred thousand, two hundred eighty-one".