215343240457 has 2 divisors, whose sum is σ = 215343240458. Its totient is φ = 215343240456.

The previous prime is 215343240407. The next prime is 215343240487. The reversal of 215343240457 is 754042343512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107778263616 + 107564976841 = 328296^2 + 327971^2 .

It is a cyclic number.

It is not a de Polignac number, because 215343240457 - 2²⁷ = 215209022729 is a prime.

It is a super-2 number, since 2×215343240457² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215343240407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107671620228 + 107671620229.

It is an arithmetic number, because the mean of its divisors is an integer number (107671620229).

Almost surely, 2^215343240457 is an apocalyptic number.

It is an amenable number.

215343240457 is a deficient number, since it is larger than the sum of its proper divisors (1).

215343240457 is an equidigital number, since it uses as much as digits as its factorization.

215343240457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 40.

Adding to 215343240457 its reverse (754042343512), we get a palindrome (969385583969).

The spelling of 215343240457 in words is "two hundred fifteen billion, three hundred forty-three million, two hundred forty thousand, four hundred fifty-seven".