665535055 has 4 divisors (see below), whose sum is σ = 798642072. Its totient is φ = 532428040.

The previous prime is 665535019. The next prime is 665535109. The reversal of 665535055 is 550535566.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 665535055 - 2²³ = 657146447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665534999 and 665535017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66553501 + ... + 66553510.

It is an arithmetic number, because the mean of its divisors is an integer number (199660518).

Almost surely, 2^665535055 is an apocalyptic number.

665535055 is a deficient number, since it is larger than the sum of its proper divisors (133107017).

665535055 is a wasteful number, since it uses less digits than its factorization.

665535055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133107016.

The product of its (nonzero) digits is 337500, while the sum is 40.

The square root of 665535055 is about 25797.9661020011. The cubic root of 665535055 is about 873.0859078847.

The spelling of 665535055 in words is "six hundred sixty-five million, five hundred thirty-five thousand, fifty-five".