665436007 has 4 divisors (see below), whose sum is σ = 676344856. Its totient is φ = 654527160.

The previous prime is 665435957. The next prime is 665436017. The reversal of 665436007 is 700634566.

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 665436007 - 2¹¹ = 665433959 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 (665436017) 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, 5454333 + ... + 5454454.

It is an arithmetic number, because the mean of its divisors is an integer number (169086214).

Almost surely, 2^665436007 is an apocalyptic number.

665436007 is a deficient number, since it is larger than the sum of its proper divisors (10908849).

665436007 is a wasteful number, since it uses less digits than its factorization.

665436007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10908848.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 665436007 is about 25796.0463443528. The cubic root of 665436007 is about 873.0425935104.

The spelling of 665436007 in words is "six hundred sixty-five million, four hundred thirty-six thousand, seven".