665513101 has 8 divisors (see below), whose sum is σ = 727005600. Its totient is φ = 604185840.

The previous prime is 665513099. The next prime is 665513131. The reversal of 665513101 is 101315566.

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 665513101 - 2¹ = 665513099 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665513101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665513131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32806 + ... + 49063.

It is an arithmetic number, because the mean of its divisors is an integer number (90875700).

Almost surely, 2^665513101 is an apocalyptic number.

It is an amenable number.

665513101 is a deficient number, since it is larger than the sum of its proper divisors (61492499).

665513101 is a wasteful number, since it uses less digits than its factorization.

665513101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82619.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 665513101 is about 25797.5405998324. The cubic root of 665513101 is about 873.0763076196.

Adding to 665513101 its reverse (101315566), we get a palindrome (766828667).

The spelling of 665513101 in words is "six hundred sixty-five million, five hundred thirteen thousand, one hundred one".