217494040643 has 8 divisors (see below), whose sum is σ = 239615397936. Its totient is φ = 195764212000.

The previous prime is 217494040633. The next prime is 217494040661. The reversal of 217494040643 is 346040494712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217494040643 - 2²⁴ = 217477263427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217494040594 and 217494040603.

It is not an unprimeable number, because it can be changed into a prime (217494040633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97880996 + ... + 97883217.

It is an arithmetic number, because the mean of its divisors is an integer number (29951924742).

Almost surely, 2^217494040643 is an apocalyptic number.

217494040643 is a deficient number, since it is larger than the sum of its proper divisors (22121357293).

217494040643 is a wasteful number, since it uses less digits than its factorization.

217494040643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195764325.

The product of its (nonzero) digits is 580608, while the sum is 44.

The spelling of 217494040643 in words is "two hundred seventeen billion, four hundred ninety-four million, forty thousand, six hundred forty-three".