217608913253 has 16 divisors (see below), whose sum is σ = 238016019456. Its totient is φ = 198056651520.

The previous prime is 217608913237. The next prime is 217608913261. The reversal of 217608913253 is 352319806712.

It is a cyclic number.

It is not a de Polignac number, because 217608913253 - 2⁴ = 217608913237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 217608913198 and 217608913207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217608993253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 573200 + ... + 873942.

It is an arithmetic number, because the mean of its divisors is an integer number (14876001216).

Almost surely, 2^217608913253 is an apocalyptic number.

It is an amenable number.

217608913253 is a deficient number, since it is larger than the sum of its proper divisors (20407106203).

217608913253 is a wasteful number, since it uses less digits than its factorization.

217608913253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302164.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 217608913253 in words is "two hundred seventeen billion, six hundred eight million, nine hundred thirteen thousand, two hundred fifty-three".