665274731 has 16 divisors (see below), whose sum is σ = 736471008. Its totient is φ = 595929600.

The previous prime is 665274677. The next prime is 665274749. The reversal of 665274731 is 137472566.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665274731 is a prime.

It is a super-3 number, since 3×665274731³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665274781) by changing a digit.

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, 223505 + ... + 226461.

It is an arithmetic number, because the mean of its divisors is an integer number (46029438).

Almost surely, 2^665274731 is an apocalyptic number.

665274731 is a deficient number, since it is larger than the sum of its proper divisors (71196277).

665274731 is a wasteful number, since it uses less digits than its factorization.

665274731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3262.

The product of its digits is 211680, while the sum is 41.

The square root of 665274731 is about 25792.9201720162. The cubic root of 665274731 is about 872.9720572043.

The spelling of 665274731 in words is "six hundred sixty-five million, two hundred seventy-four thousand, seven hundred thirty-one".