217493664090 has 64 divisors (see below), whose sum is σ = 526255107840. Its totient is φ = 57525347840.

The previous prime is 217493664071. The next prime is 217493664151. The reversal of 217493664090 is 90466394712.

It is a happy number.

217493664090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 2262526 + ... + 2356694.

It is an arithmetic number, because the mean of its divisors is an integer number (8222736060).

Almost surely, 2^217493664090 is an apocalyptic number.

217493664090 is an abundant number, since it is smaller than the sum of its proper divisors (308761443750).

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

217493664090 is a wasteful number, since it uses less digits than its factorization.

217493664090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94807.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 217493664090 in words is "two hundred seventeen billion, four hundred ninety-three million, six hundred sixty-four thousand, ninety".