665273755 has 16 divisors (see below), whose sum is σ = 814613760. Its totient is φ = 521392768.

The previous prime is 665273737. The next prime is 665273779. The reversal of 665273755 is 557372566.

It is a cyclic number.

It is not a de Polignac number, because 665273755 - 2²³ = 656885147 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227241 + ... + 230149.

It is an arithmetic number, because the mean of its divisors is an integer number (50913360).

Almost surely, 2^665273755 is an apocalyptic number.

665273755 is a deficient number, since it is larger than the sum of its proper divisors (149340005).

665273755 is a wasteful number, since it uses less digits than its factorization.

665273755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830.

The product of its digits is 1323000, while the sum is 46.

The square root of 665273755 is about 25792.9012520887. The cubic root of 665273755 is about 872.9716303024.

The spelling of 665273755 in words is "six hundred sixty-five million, two hundred seventy-three thousand, seven hundred fifty-five".