665035247 has 4 divisors (see below), whose sum is σ = 667173936. Its totient is φ = 662896560.

The previous prime is 665035243. The next prime is 665035277. The reversal of 665035247 is 742530566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 665035247 - 2² = 665035243 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 665035247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665035243) 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, 1068878 + ... + 1069499.

It is an arithmetic number, because the mean of its divisors is an integer number (166793484).

Almost surely, 2^665035247 is an apocalyptic number.

665035247 is a deficient number, since it is larger than the sum of its proper divisors (2138689).

665035247 is a wasteful number, since it uses less digits than its factorization.

665035247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138688.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 665035247 is about 25788.2773174169. The cubic root of 665035247 is about 872.8672945043.

The spelling of 665035247 in words is "six hundred sixty-five million, thirty-five thousand, two hundred forty-seven".