217400401705 has 8 divisors (see below), whose sum is σ = 264774220992. Its totient is φ = 171324495408.

The previous prime is 217400401637. The next prime is 217400401739. The reversal of 217400401705 is 507104004712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 217400401705 - 2¹³ = 217400393513 is a prime.

It is a super-2 number, since 2×217400401705² (a number of 23 digits) contains 22 as substring.

It is a Duffinian 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, 324477877 + ... + 324478546.

It is an arithmetic number, because the mean of its divisors is an integer number (33096777624).

Almost surely, 2^217400401705 is an apocalyptic number.

It is an amenable number.

217400401705 is a deficient number, since it is larger than the sum of its proper divisors (47373819287).

217400401705 is an equidigital number, since it uses as much as digits as its factorization.

217400401705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648956495.

The product of its (nonzero) digits is 7840, while the sum is 31.

The spelling of 217400401705 in words is "two hundred seventeen billion, four hundred million, four hundred one thousand, seven hundred five".