13217108657 has 2 divisors, whose sum is σ = 13217108658. Its totient is φ = 13217108656.

The previous prime is 13217108581. The next prime is 13217108683. The reversal of 13217108657 is 75680171231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7739776576 + 5477332081 = 87976^2 + 74009^2 .

It is a cyclic number.

It is not a de Polignac number, because 13217108657 - 2²⁸ = 12948673201 is a prime.

It is a super-2 number, since 2×13217108657² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13217101657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6608554328 + 6608554329.

It is an arithmetic number, because the mean of its divisors is an integer number (6608554329).

Almost surely, 2^13217108657 is an apocalyptic number.

It is an amenable number.

13217108657 is a deficient number, since it is larger than the sum of its proper divisors (1).

13217108657 is an equidigital number, since it uses as much as digits as its factorization.

13217108657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

Adding to 13217108657 its reverse (75680171231), we get a palindrome (88897279888).

The spelling of 13217108657 in words is "thirteen billion, two hundred seventeen million, one hundred eight thousand, six hundred fifty-seven".