68399224561 has 4 divisors (see below), whose sum is σ = 68414486512. Its totient is φ = 68383962612.

The previous prime is 68399224541. The next prime is 68399224577. The reversal of 68399224561 is 16542299386.

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 68399224561 - 2⁷ = 68399224433 is a prime.

It is a super-2 number, since 2×68399224561² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68399224541) 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, 7624251 + ... + 7633216.

It is an arithmetic number, because the mean of its divisors is an integer number (17103621628).

Almost surely, 2^68399224561 is an apocalyptic number.

It is an amenable number.

68399224561 is a deficient number, since it is larger than the sum of its proper divisors (15261951).

68399224561 is a wasteful number, since it uses less digits than its factorization.

68399224561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15261950.

The product of its digits is 5598720, while the sum is 55.

The spelling of 68399224561 in words is "sixty-eight billion, three hundred ninety-nine million, two hundred twenty-four thousand, five hundred sixty-one".