660555606055 has 4 divisors (see below), whose sum is σ = 792666727272. Its totient is φ = 528444484840.

The previous prime is 660555605947. The next prime is 660555606101. The reversal of 660555606055 is 550606555066.

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

It is not a de Polignac number, because 660555606055 - 2³⁹ = 110799792167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66055560601 + ... + 66055560610.

It is an arithmetic number, because the mean of its divisors is an integer number (198166681818).

Almost surely, 2^660555606055 is an apocalyptic number.

660555606055 is a deficient number, since it is larger than the sum of its proper divisors (132111121217).

660555606055 is a wasteful number, since it uses less digits than its factorization.

660555606055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132111121216.

The product of its (nonzero) digits is 4050000, while the sum is 49.

The spelling of 660555606055 in words is "six hundred sixty billion, five hundred fifty-five million, six hundred six thousand, fifty-five".