660201217 has 4 divisors (see below), whose sum is σ = 710985940. Its totient is φ = 609416496.

The previous prime is 660201181. The next prime is 660201221. The reversal of 660201217 is 712102066.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 347300496 + 312900721 = 18636^2 + 17689^2 .

It is not a de Polignac number, because 660201217 - 2¹⁹ = 659676929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660201191 and 660201200.

It is not an unprimeable number, because it can be changed into a prime (660201247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25392342 + ... + 25392367.

It is an arithmetic number, because the mean of its divisors is an integer number (177746485).

Almost surely, 2^660201217 is an apocalyptic number.

It is an amenable number.

660201217 is a deficient number, since it is larger than the sum of its proper divisors (50784723).

660201217 is a wasteful number, since it uses less digits than its factorization.

660201217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50784722.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 660201217 is about 25694.3810394413. The cubic root of 660201217 is about 870.7472406046.

The spelling of 660201217 in words is "six hundred sixty million, two hundred one thousand, two hundred seventeen".