217714945261 has 4 divisors (see below), whose sum is σ = 237507213024. Its totient is φ = 197922677500.

The previous prime is 217714945241. The next prime is 217714945277. The reversal of 217714945261 is 162549417712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 217714945261 - 2⁵ = 217714945229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217714945241) 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, 9896133865 + ... + 9896133886.

It is an arithmetic number, because the mean of its divisors is an integer number (59376803256).

Almost surely, 2^217714945261 is an apocalyptic number.

It is an amenable number.

217714945261 is a deficient number, since it is larger than the sum of its proper divisors (19792267763).

217714945261 is a wasteful number, since it uses less digits than its factorization.

217714945261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19792267762.

The product of its digits is 846720, while the sum is 49.

The spelling of 217714945261 in words is "two hundred seventeen billion, seven hundred fourteen million, nine hundred forty-five thousand, two hundred sixty-one".