6966721679 has 2 divisors, whose sum is σ = 6966721680. Its totient is φ = 6966721678.

The previous prime is 6966721673. The next prime is 6966721691. The reversal of 6966721679 is 9761276696.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6966721679 - 2²⁰ = 6965673103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6966721673) 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 as a sum of consecutive naturals, namely, 3483360839 + 3483360840.

It is an arithmetic number, because the mean of its divisors is an integer number (3483360840).

Almost surely, 2^6966721679 is an apocalyptic number.

6966721679 is a deficient number, since it is larger than the sum of its proper divisors (1).

6966721679 is an equidigital number, since it uses as much as digits as its factorization.

6966721679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 59.

The square root of 6966721679 is about 83466.8897168212. The cubic root of 6966721679 is about 1909.8949787380.

The spelling of 6966721679 in words is "six billion, nine hundred sixty-six million, seven hundred twenty-one thousand, six hundred seventy-nine".