68445235661 has 8 divisors (see below), whose sum is σ = 79059737664. Its totient is φ = 58562768320.

The previous prime is 68445235643. The next prime is 68445235669. The reversal of 68445235661 is 16653254486.

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 68445235661 - 2¹⁸ = 68444973517 is a prime.

It is a super-2 number, since 2×68445235661² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68445235669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183008465 + ... + 183008838.

It is an arithmetic number, because the mean of its divisors is an integer number (9882467208).

Almost surely, 2^68445235661 is an apocalyptic number.

It is an amenable number.

68445235661 is a deficient number, since it is larger than the sum of its proper divisors (10614502003).

68445235661 is a wasteful number, since it uses less digits than its factorization.

68445235661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366017331.

The product of its digits is 4147200, while the sum is 50.

The spelling of 68445235661 in words is "sixty-eight billion, four hundred forty-five million, two hundred thirty-five thousand, six hundred sixty-one".