655665511 has 2 divisors, whose sum is σ = 655665512. Its totient is φ = 655665510.

The previous prime is 655665497. The next prime is 655665559. The reversal of 655665511 is 115566556.

655665511 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655665511 - 2¹³ = 655657319 is a prime.

It is a super-2 number, since 2×655665511² = 859794524629782242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655665811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327832755 + 327832756.

It is an arithmetic number, because the mean of its divisors is an integer number (327832756).

Almost surely, 2^655665511 is an apocalyptic number.

655665511 is a deficient number, since it is larger than the sum of its proper divisors (1).

655665511 is an equidigital number, since it uses as much as digits as its factorization.

655665511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135000, while the sum is 40.

The square root of 655665511 is about 25605.9663164662. The cubic root of 655665511 is about 868.7485910230.

The spelling of 655665511 in words is "six hundred fifty-five million, six hundred sixty-five thousand, five hundred eleven".