217608959157 has 16 divisors (see below), whose sum is σ = 291105912960. Its totient is φ = 144593115392.

The previous prime is 217608959129. The next prime is 217608959159. The reversal of 217608959157 is 751959806712.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217608959157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217608959157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217608959159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1005913 + ... + 1202945.

It is an arithmetic number, because the mean of its divisors is an integer number (18194119560).

Almost surely, 2^217608959157 is an apocalyptic number.

It is an amenable number.

217608959157 is a deficient number, since it is larger than the sum of its proper divisors (73496953803).

217608959157 is a wasteful number, since it uses less digits than its factorization.

217608959157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198252.

The product of its (nonzero) digits is 9525600, while the sum is 60.

The spelling of 217608959157 in words is "two hundred seventeen billion, six hundred eight million, nine hundred fifty-nine thousand, one hundred fifty-seven".