217315136164 has 24 divisors (see below), whose sum is σ = 442830846528. Its totient is φ = 91377792480.

The previous prime is 217315136149. The next prime is 217315136191. The reversal of 217315136164 is 461631513712.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73217902 + ... + 73220869.

It is an arithmetic number, because the mean of its divisors is an integer number (18451285272).

Almost surely, 2^217315136164 is an apocalyptic number.

It is an amenable number.

217315136164 is an abundant number, since it is smaller than the sum of its proper divisors (225515710364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217315136164 is a wasteful number, since it uses less digits than its factorization.

217315136164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146438835 (or 146438833 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

Adding to 217315136164 its reverse (461631513712), we get a palindrome (678946649876).

The spelling of 217315136164 in words is "two hundred seventeen billion, three hundred fifteen million, one hundred thirty-six thousand, one hundred sixty-four".