7266057721717 has 4 divisors (see below), whose sum is σ = 7693472881836. Its totient is φ = 6838642561600.

The previous prime is 7266057721669. The next prime is 7266057721739. The reversal of 7266057721717 is 7171277506627.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4286063418961 + 2979994302756 = 2070281^2 + 1726266^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7266057721717 is a prime.

It is a super-2 number, since 2×7266057721717² (a number of 27 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 (7266057721217) 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, 213707580034 + ... + 213707580067.

It is an arithmetic number, because the mean of its divisors is an integer number (1923368220459).

Almost surely, 2^{7266057721717} is an apocalyptic number.

It is an amenable number.

7266057721717 is a deficient number, since it is larger than the sum of its proper divisors (427415160119).

7266057721717 is a wasteful number, since it uses less digits than its factorization.

7266057721717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427415160118.

The product of its (nonzero) digits is 12101040, while the sum is 58.

The spelling of 7266057721717 in words is "seven trillion, two hundred sixty-six billion, fifty-seven million, seven hundred twenty-one thousand, seven hundred seventeen".