68943007961 has 4 divisors (see below), whose sum is σ = 69355840512. Its totient is φ = 68530175412.

The previous prime is 68943007949. The next prime is 68943007967. The reversal of 68943007961 is 16970034986.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16970034986 = 2 ⋅8485017493.

It is a cyclic number.

It is not a de Polignac number, because 68943007961 - 2²⁶ = 68875899097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68943007967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206416025 + ... + 206416358.

It is an arithmetic number, because the mean of its divisors is an integer number (17338960128).

Almost surely, 2^68943007961 is an apocalyptic number.

It is an amenable number.

68943007961 is a deficient number, since it is larger than the sum of its proper divisors (412832551).

68943007961 is a wasteful number, since it uses less digits than its factorization.

68943007961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412832550.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 68943007961 in words is "sixty-eight billion, nine hundred forty-three million, seven thousand, nine hundred sixty-one".