665276523 has 16 divisors (see below), whose sum is σ = 916494336. Its totient is φ = 428814720.

The previous prime is 665276509. The next prime is 665276561. The reversal of 665276523 is 325672566.

It is not a de Polignac number, because 665276523 - 2⁸ = 665276267 is a prime.

It is a super-3 number, since 3×665276523³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (665276503) 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, 124515 + ... + 129747.

It is an arithmetic number, because the mean of its divisors is an integer number (57280896).

Almost surely, 2^665276523 is an apocalyptic number.

665276523 is a deficient number, since it is larger than the sum of its proper divisors (251217813).

665276523 is a wasteful number, since it uses less digits than its factorization.

665276523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6634.

The product of its digits is 453600, while the sum is 42.

The square root of 665276523 is about 25792.9549102076. The cubic root of 665276523 is about 872.9728410231.

The spelling of 665276523 in words is "six hundred sixty-five million, two hundred seventy-six thousand, five hundred twenty-three".