6656722974719 has 4 divisors (see below), whose sum is σ = 6657457802520. Its totient is φ = 6655988146920.

The previous prime is 6656722974661. The next prime is 6656722974721. The reversal of 6656722974719 is 9174792276566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6656722974719 - 2⁴⁰ = 5557211346943 is a prime.

It is a super-2 number, since 2×6656722974719² (a number of 26 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 (6656722974739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 367400312 + ... + 367418429.

It is an arithmetic number, because the mean of its divisors is an integer number (1664364450630).

Almost surely, 2^{6656722974719} is an apocalyptic number.

6656722974719 is a deficient number, since it is larger than the sum of its proper divisors (734827801).

6656722974719 is an equidigital number, since it uses as much as digits as its factorization.

6656722974719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734827800.

The product of its digits is 480090240, while the sum is 71.

The spelling of 6656722974719 in words is "six trillion, six hundred fifty-six billion, seven hundred twenty-two million, nine hundred seventy-four thousand, seven hundred nineteen".