68440446691 has 2 divisors, whose sum is σ = 68440446692. Its totient is φ = 68440446690.

The previous prime is 68440446671. The next prime is 68440446703. The reversal of 68440446691 is 19664404486.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68440446691 is a prime.

It is a super-2 number, since 2×68440446691² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68440446631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34220223345 + 34220223346.

It is an arithmetic number, because the mean of its divisors is an integer number (34220223346).

Almost surely, 2^68440446691 is an apocalyptic number.

68440446691 is a deficient number, since it is larger than the sum of its proper divisors (1).

68440446691 is an equidigital number, since it uses as much as digits as its factorization.

68440446691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3981312, while the sum is 52.

The spelling of 68440446691 in words is "sixty-eight billion, four hundred forty million, four hundred forty-six thousand, six hundred ninety-one".