665201265 has 16 divisors (see below), whose sum is σ = 1075296768. Its totient is φ = 351115776.

The previous prime is 665201249. The next prime is 665201287. The reversal of 665201265 is 562102566.

It is a happy number.

665201265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665201265 - 2⁴ = 665201249 is a prime.

It is a Curzon 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, 227137 + ... + 230046.

It is an arithmetic number, because the mean of its divisors is an integer number (67206048).

Almost surely, 2^665201265 is an apocalyptic number.

It is an amenable number.

665201265 is a deficient number, since it is larger than the sum of its proper divisors (410095503).

665201265 is a wasteful number, since it uses less digits than its factorization.

665201265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457288.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 665201265 is about 25791.4959822031. The cubic root of 665201265 is about 872.9399220461.

It can be divided in two parts, 665 and 201265, that added together give a triangular number (201930 = T₆₃₅).

The spelling of 665201265 in words is "six hundred sixty-five million, two hundred one thousand, two hundred sixty-five".