68352022645 has 4 divisors (see below), whose sum is σ = 82022427180. Its totient is φ = 54681618112.

The previous prime is 68352022637. The next prime is 68352022657. The reversal of 68352022645 is 54622025386.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54622025386 = 2 ⋅27311012693.

It can be written as a sum of positive squares in 2 ways, for example, as 38075326641 + 30276696004 = 195129^2 + 174002^2 .

It is a cyclic number.

It is not a de Polignac number, because 68352022645 - 2³ = 68352022637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6835202260 + ... + 6835202269.

It is an arithmetic number, because the mean of its divisors is an integer number (20505606795).

Almost surely, 2^68352022645 is an apocalyptic number.

It is an amenable number.

68352022645 is a deficient number, since it is larger than the sum of its proper divisors (13670404535).

68352022645 is a wasteful number, since it uses less digits than its factorization.

68352022645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13670404534.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 68352022645 in words is "sixty-eight billion, three hundred fifty-two million, twenty-two thousand, six hundred forty-five".