665700012565 has 32 divisors (see below), whose sum is σ = 929339744256. Its totient is φ = 448339053120.

The previous prime is 665700012553. The next prime is 665700012589. The reversal of 665700012565 is 565210007566.

It is not a de Polignac number, because 665700012565 - 2²⁵ = 665666458133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 144264 + ... + 1162846.

It is an arithmetic number, because the mean of its divisors is an integer number (29041867008).

Almost surely, 2^665700012565 is an apocalyptic number.

It is an amenable number.

665700012565 is a deficient number, since it is larger than the sum of its proper divisors (263639731691).

665700012565 is a wasteful number, since it uses less digits than its factorization.

665700012565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018929.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 665700012565 in words is "six hundred sixty-five billion, seven hundred million, twelve thousand, five hundred sixty-five".