665244613 has 8 divisors (see below), whose sum is σ = 726398496. Its totient is φ = 604203600.

The previous prime is 665244599. The next prime is 665244623. The reversal of 665244613 is 316442566.

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

It is not a de Polignac number, because 665244613 - 2¹³ = 665236421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665244623) 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, 15643 + ... + 39688.

It is an arithmetic number, because the mean of its divisors is an integer number (90799812).

Almost surely, 2^665244613 is an apocalyptic number.

It is an amenable number.

665244613 is a deficient number, since it is larger than the sum of its proper divisors (61153883).

665244613 is a wasteful number, since it uses less digits than its factorization.

665244613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56435.

The product of its digits is 103680, while the sum is 37.

The square root of 665244613 is about 25792.3363230243. The cubic root of 665244613 is about 872.9588834141.

The spelling of 665244613 in words is "six hundred sixty-five million, two hundred forty-four thousand, six hundred thirteen".