665625413 has 4 divisors (see below), whose sum is σ = 665717100. Its totient is φ = 665533728.

The previous prime is 665625407. The next prime is 665625431. The reversal of 665625413 is 314526566.

It is a happy number.

665625413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 241553764 + 424071649 = 15542^2 + 20593^2 .

It is a cyclic number.

It is not a de Polignac number, because 665625413 - 2¹² = 665621317 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 (665625403) 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, 33920 + ... + 49817.

It is an arithmetic number, because the mean of its divisors is an integer number (166429275).

Almost surely, 2^665625413 is an apocalyptic number.

It is an amenable number.

665625413 is a deficient number, since it is larger than the sum of its proper divisors (91687).

665625413 is an equidigital number, since it uses as much as digits as its factorization.

665625413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91686.

The product of its digits is 129600, while the sum is 38.

The square root of 665625413 is about 25799.7173046528. The cubic root of 665625413 is about 873.1254183136.

The spelling of 665625413 in words is "six hundred sixty-five million, six hundred twenty-five thousand, four hundred thirteen".