665045655 has 16 divisors (see below), whose sum is σ = 1064444640. Its totient is φ = 354567168.

The previous prime is 665045617. The next prime is 665045671. The reversal of 665045655 is 556540566.

It is not a de Polignac number, because 665045655 - 2⁷ = 665045527 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 51051 + ... + 62739.

It is an arithmetic number, because the mean of its divisors is an integer number (66527790).

Almost surely, 2^665045655 is an apocalyptic number.

665045655 is a deficient number, since it is larger than the sum of its proper divisors (399398985).

665045655 is a wasteful number, since it uses less digits than its factorization.

665045655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15490.

The product of its (nonzero) digits is 540000, while the sum is 42.

The square root of 665045655 is about 25788.4791137438. The cubic root of 665045655 is about 872.8718480251.

The spelling of 665045655 in words is "six hundred sixty-five million, forty-five thousand, six hundred fifty-five".