217727040497 has 4 divisors (see below), whose sum is σ = 219653828580. Its totient is φ = 215800252416.

The previous prime is 217727040467. The next prime is 217727040511. The reversal of 217727040497 is 794040727712.

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 58177922401 + 159549118096 = 241201^2 + 399436^2 .

It is a cyclic number.

It is not a de Polignac number, because 217727040497 - 2¹⁴ = 217727024113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217727040407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 963393872 + ... + 963394097.

It is an arithmetic number, because the mean of its divisors is an integer number (54913457145).

Almost surely, 2^217727040497 is an apocalyptic number.

It is an amenable number.

217727040497 is a deficient number, since it is larger than the sum of its proper divisors (1926788083).

217727040497 is a wasteful number, since it uses less digits than its factorization.

217727040497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926788082.

The product of its (nonzero) digits is 1382976, while the sum is 50.

The spelling of 217727040497 in words is "two hundred seventeen billion, seven hundred twenty-seven million, forty thousand, four hundred ninety-seven".