665274913 has 2 divisors, whose sum is σ = 665274914. Its totient is φ = 665274912.

The previous prime is 665274893. The next prime is 665274917. The reversal of 665274913 is 319472566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 643484689 + 21790224 = 25367^2 + 4668^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665274913 is a prime.

It is a super-3 number, since 3×665274913³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665274913.

It is not a weakly prime, because it can be changed into another prime (665274917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332637456 + 332637457.

It is an arithmetic number, because the mean of its divisors is an integer number (332637457).

Almost surely, 2^665274913 is an apocalyptic number.

It is an amenable number.

665274913 is a deficient number, since it is larger than the sum of its proper divisors (1).

665274913 is an equidigital number, since it uses as much as digits as its factorization.

665274913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 43.

The square root of 665274913 is about 25792.9237001159. The cubic root of 665274913 is about 872.9721368109.

The spelling of 665274913 in words is "six hundred sixty-five million, two hundred seventy-four thousand, nine hundred thirteen".