217161163875580 has 48 divisors (see below), whose sum is σ = 480498085620000. Its totient is φ = 82214202756096.

The previous prime is 217161163875571. The next prime is 217161163875587. The reversal of 217161163875580 is 85578361161712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217161163875587) 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 15 ways as a sum of consecutive naturals, for example, 271992585 + ... + 272789824.

It is an arithmetic number, because the mean of its divisors is an integer number (10010376783750).

Almost surely, 2^{217161163875580} is an apocalyptic number.

217161163875580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217161163875580 is an abundant number, since it is smaller than the sum of its proper divisors (263336921744420).

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

217161163875580 is a wasteful number, since it uses less digits than its factorization.

217161163875580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544783486 (or 544783484 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 61.

The spelling of 217161163875580 in words is "two hundred seventeen trillion, one hundred sixty-one billion, one hundred sixty-three million, eight hundred seventy-five thousand, five hundred eighty".