665042906607 has 16 divisors (see below), whose sum is σ = 910740701280. Its totient is φ = 431354875392.

The previous prime is 665042906603. The next prime is 665042906629. The reversal of 665042906607 is 706609240566.

It is a happy number.

It is not a de Polignac number, because 665042906607 - 2² = 665042906603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665042906607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665042906603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926619 + ... + 2245427.

It is an arithmetic number, because the mean of its divisors is an integer number (56921293830).

Almost surely, 2^665042906607 is an apocalyptic number.

665042906607 is a deficient number, since it is larger than the sum of its proper divisors (245697794673).

665042906607 is a wasteful number, since it uses less digits than its factorization.

665042906607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337642.

The product of its (nonzero) digits is 3265920, while the sum is 51.

The spelling of 665042906607 in words is "six hundred sixty-five billion, forty-two million, nine hundred six thousand, six hundred seven".