665908201 has 8 divisors (see below), whose sum is σ = 768884480. Its totient is φ = 564893568.

The previous prime is 665908171. The next prime is 665908223. The reversal of 665908201 is 102809566.

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 665908201 - 2⁵ = 665908169 is a prime.

It is a super-3 number, since 3×665908201³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (665908291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489681 + ... + 491038.

It is an arithmetic number, because the mean of its divisors is an integer number (96110560).

Almost surely, 2^665908201 is an apocalyptic number.

It is an amenable number.

665908201 is a deficient number, since it is larger than the sum of its proper divisors (102976279).

665908201 is an equidigital number, since it uses as much as digits as its factorization.

665908201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980823.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 665908201 is about 25805.1971703376. The cubic root of 665908201 is about 873.2490486258.

The spelling of 665908201 in words is "six hundred sixty-five million, nine hundred eight thousand, two hundred one".