665505349 has 2 divisors, whose sum is σ = 665505350. Its totient is φ = 665505348.

The previous prime is 665505331. The next prime is 665505359. The reversal of 665505349 is 943505566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 604274724 + 61230625 = 24582^2 + 7825^2 .

It is a cyclic number.

It is not a de Polignac number, because 665505349 - 2⁷ = 665505221 is a prime.

It is a super-2 number, since 2×665505349² = 885794739095223602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665505359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332752674 + 332752675.

It is an arithmetic number, because the mean of its divisors is an integer number (332752675).

Almost surely, 2^665505349 is an apocalyptic number.

It is an amenable number.

665505349 is a deficient number, since it is larger than the sum of its proper divisors (1).

665505349 is an equidigital number, since it uses as much as digits as its factorization.

665505349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 665505349 is about 25797.3903525143. The cubic root of 665505349 is about 873.0729176970.

The spelling of 665505349 in words is "six hundred sixty-five million, five hundred five thousand, three hundred forty-nine".