217906261441 has 4 divisors (see below), whose sum is σ = 237715921584. Its totient is φ = 198096601300.

The previous prime is 217906261393. The next prime is 217906261481. The reversal of 217906261441 is 144162609712.

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 217906261441 - 2¹⁷ = 217906130369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217906261481) 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, 9904830055 + ... + 9904830076.

It is an arithmetic number, because the mean of its divisors is an integer number (59428980396).

Almost surely, 2^217906261441 is an apocalyptic number.

It is an amenable number.

217906261441 is a deficient number, since it is larger than the sum of its proper divisors (19809660143).

217906261441 is a wasteful number, since it uses less digits than its factorization.

217906261441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19809660142.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 217906261441 in words is "two hundred seventeen billion, nine hundred six million, two hundred sixty-one thousand, four hundred forty-one".