217451087660 has 12 divisors (see below), whose sum is σ = 456647284128. Its totient is φ = 86980435056.

The previous prime is 217451087593. The next prime is 217451087671. The reversal of 217451087660 is 66780154712.

217451087660 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5436277172 + ... + 5436277211.

It is an arithmetic number, because the mean of its divisors is an integer number (38053940344).

Almost surely, 2^217451087660 is an apocalyptic number.

217451087660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217451087660 is an abundant number, since it is smaller than the sum of its proper divisors (239196196468).

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

217451087660 is a wasteful number, since it uses less digits than its factorization.

217451087660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872554392 (or 10872554390 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 47.

The spelling of 217451087660 in words is "two hundred seventeen billion, four hundred fifty-one million, eighty-seven thousand, six hundred sixty".