217185500345380 has 96 divisors (see below), whose sum is σ = 522202465403136. Its totient is φ = 74326859076096.

The previous prime is 217185500345371. The next prime is 217185500345423. The reversal of 217185500345380 is 83543005581712.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2737604194 + ... + 2737683526.

It is an arithmetic number, because the mean of its divisors is an integer number (5439609014616).

Almost surely, 2^{217185500345380} is an apocalyptic number.

217185500345380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217185500345380 is an abundant number, since it is smaller than the sum of its proper divisors (305016965057756).

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

217185500345380 is a wasteful number, since it uses less digits than its factorization.

217185500345380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115013 (or 115011 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 52.

The spelling of 217185500345380 in words is "two hundred seventeen trillion, one hundred eighty-five billion, five hundred million, three hundred forty-five thousand, three hundred eighty".