660555071 has 8 divisors (see below), whose sum is σ = 721530624. Its totient is φ = 599733720.

The previous prime is 660555053. The next prime is 660555073. The reversal of 660555071 is 170555066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660555071 - 2¹⁰ = 660554047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660555073) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 29495 + ... + 46808.

It is an arithmetic number, because the mean of its divisors is an integer number (90191328).

Almost surely, 2^660555071 is an apocalyptic number.

660555071 is a deficient number, since it is larger than the sum of its proper divisors (60975553).

660555071 is a wasteful number, since it uses less digits than its factorization.

660555071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77101.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 660555071 is about 25701.2659415835. The cubic root of 660555071 is about 870.9027802363.

The spelling of 660555071 in words is "six hundred sixty million, five hundred fifty-five thousand, seventy-one".