5171666623309 has 2 divisors, whose sum is σ = 5171666623310. Its totient is φ = 5171666623308.

The previous prime is 5171666623297. The next prime is 5171666623339. The reversal of 5171666623309 is 9033266661715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2914115298084 + 2257551325225 = 1707078^2 + 1502515^2 .

It is a cyclic number.

It is not a de Polignac number, because 5171666623309 - 2²¹ = 5171664526157 is a prime.

It is a super-2 number, since 2×5171666623309² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 5171666623309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5171666623339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2585833311654 + 2585833311655.

It is an arithmetic number, because the mean of its divisors is an integer number (2585833311655).

Almost surely, 2^{5171666623309} is an apocalyptic number.

It is an amenable number.

5171666623309 is a deficient number, since it is larger than the sum of its proper divisors (1).

5171666623309 is an equidigital number, since it uses as much as digits as its factorization.

5171666623309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 55.

It can be divided in two parts, 5171666 and 623309, that added together give a palindrome (5794975).

The spelling of 5171666623309 in words is "five trillion, one hundred seventy-one billion, six hundred sixty-six million, six hundred twenty-three thousand, three hundred nine".