665026402207 has 4 divisors (see below), whose sum is σ = 665195667120. Its totient is φ = 664857137296.

The previous prime is 665026402121. The next prime is 665026402211. The reversal of 665026402207 is 702204620566.

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 665026402207 - 2¹⁵ = 665026369439 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 665026402207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665026402217) 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, 84626563 + ... + 84634420.

It is an arithmetic number, because the mean of its divisors is an integer number (166298916780).

Almost surely, 2^665026402207 is an apocalyptic number.

665026402207 is a deficient number, since it is larger than the sum of its proper divisors (169264913).

665026402207 is a wasteful number, since it uses less digits than its factorization.

665026402207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169264912.

The product of its (nonzero) digits is 241920, while the sum is 40.

The spelling of 665026402207 in words is "six hundred sixty-five billion, twenty-six million, four hundred two thousand, two hundred seven".