665136005 has 16 divisors (see below), whose sum is σ = 807700464. Its totient is φ = 525772800.

The previous prime is 665135981. The next prime is 665136037. The reversal of 665136005 is 500631566.

665136005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 48011041 + 617124964 = 6929^2 + 24842^2 .

It is not a de Polignac number, because 665136005 - 2²⁰ = 664087429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328757 + ... + 330773.

It is an arithmetic number, because the mean of its divisors is an integer number (50481279).

Almost surely, 2^665136005 is an apocalyptic number.

It is an amenable number.

665136005 is a deficient number, since it is larger than the sum of its proper divisors (142564459).

665136005 is a wasteful number, since it uses less digits than its factorization.

665136005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 665136005 is about 25790.2308054814. The cubic root of 665136005 is about 872.9113743342.

The spelling of 665136005 in words is "six hundred sixty-five million, one hundred thirty-six thousand, five".