217306253115557 has 8 divisors (see below), whose sum is σ = 222132836937216. Its totient is φ = 212488129565712.

The previous prime is 217306253115527. The next prime is 217306253115563. The reversal of 217306253115557 is 755511352603712.

It is a happy number.

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 217306253115557 - 2²⁸ = 217305984680101 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217306253115499 and 217306253115508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217306253115527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2115016013 + ... + 2115118754.

It is an arithmetic number, because the mean of its divisors is an integer number (27766604617152).

Almost surely, 2^{217306253115557} is an apocalyptic number.

It is an amenable number.

217306253115557 is a deficient number, since it is larger than the sum of its proper divisors (4826583821659).

217306253115557 is a wasteful number, since it uses less digits than its factorization.

217306253115557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4230135907.

The product of its (nonzero) digits is 6615000, while the sum is 53.

The spelling of 217306253115557 in words is "two hundred seventeen trillion, three hundred six billion, two hundred fifty-three million, one hundred fifteen thousand, five hundred fifty-seven".