68521268022281 has 4 divisors (see below), whose sum is σ = 69979167341952. Its totient is φ = 67063368702612.

The previous prime is 68521268022217. The next prime is 68521268022289. The reversal of 68521268022281 is 18222086212586.

68521268022281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68521268022281 - 2⁶ = 68521268022217 is a prime.

It is a super-2 number, since 2×68521268022281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68521268022289) 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 3 ways as a sum of consecutive naturals, for example, 728949659765 + ... + 728949659858.

It is an arithmetic number, because the mean of its divisors is an integer number (17494791835488).

Almost surely, 2^{68521268022281} is an apocalyptic number.

It is an amenable number.

68521268022281 is a deficient number, since it is larger than the sum of its proper divisors (1457899319671).

68521268022281 is a wasteful number, since it uses less digits than its factorization.

68521268022281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457899319670.

The product of its (nonzero) digits is 2949120, while the sum is 53.

The spelling of 68521268022281 in words is "sixty-eight trillion, five hundred twenty-one billion, two hundred sixty-eight million, twenty-two thousand, two hundred eighty-one".