215317717247 has 2 divisors, whose sum is σ = 215317717248. Its totient is φ = 215317717246.

The previous prime is 215317717213. The next prime is 215317717253. The reversal of 215317717247 is 742717713512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215317717247 - 2¹⁰ = 215317716223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215316717247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107658858623 + 107658858624.

It is an arithmetic number, because the mean of its divisors is an integer number (107658858624).

Almost surely, 2^215317717247 is an apocalyptic number.

215317717247 is a deficient number, since it is larger than the sum of its proper divisors (1).

215317717247 is an equidigital number, since it uses as much as digits as its factorization.

215317717247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576240, while the sum is 47.

The spelling of 215317717247 in words is "two hundred fifteen billion, three hundred seventeen million, seven hundred seventeen thousand, two hundred forty-seven".