665346397 has 4 divisors (see below), whose sum is σ = 686809216. Its totient is φ = 643883580.

The previous prime is 665346359. The next prime is 665346403. The reversal of 665346397 is 793643566.

665346397 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 665346397 - 2²³ = 656957789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665346397.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665346347) 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, 10731363 + ... + 10731424.

It is an arithmetic number, because the mean of its divisors is an integer number (171702304).

Almost surely, 2^665346397 is an apocalyptic number.

It is an amenable number.

665346397 is a deficient number, since it is larger than the sum of its proper divisors (21462819).

665346397 is a wasteful number, since it uses less digits than its factorization.

665346397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21462818.

The product of its digits is 2449440, while the sum is 49.

The square root of 665346397 is about 25794.3093918019. The cubic root of 665346397 is about 873.0034027353.

The spelling of 665346397 in words is "six hundred sixty-five million, three hundred forty-six thousand, three hundred ninety-seven".