665126052005 has 16 divisors (see below), whose sum is σ = 803705777280. Its totient is φ = 528410670528.

The previous prime is 665126052001. The next prime is 665126052047. The reversal of 665126052005 is 500250621566.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 665126052005 - 2² = 665126052001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665126052005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665126052001) 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, 387545 + ... + 1216734.

It is an arithmetic number, because the mean of its divisors is an integer number (50231611080).

Almost surely, 2^665126052005 is an apocalyptic number.

It is an amenable number.

665126052005 is a deficient number, since it is larger than the sum of its proper divisors (138579725275).

665126052005 is a wasteful number, since it uses less digits than its factorization.

665126052005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604860.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 665126052005 in words is "six hundred sixty-five billion, one hundred twenty-six million, fifty-two thousand, five".