660202985 has 12 divisors (see below), whose sum is σ = 853453188. Its totient is φ = 487381536.

The previous prime is 660202901. The next prime is 660202987. The reversal of 660202985 is 589202066.

It can be written as a sum of positive squares in 2 ways, for example, as 162511504 + 497691481 = 12748^2 + 22309^2 .

It is not a de Polignac number, because 660202985 - 2¹⁰ = 660201961 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 (660202987) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205562 + ... + 208748.

It is an arithmetic number, because the mean of its divisors is an integer number (71121099).

Almost surely, 2^660202985 is an apocalyptic number.

660202985 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

660202985 is a deficient number, since it is larger than the sum of its proper divisors (193250203).

660202985 is an frugal number, since it uses more digits than its factorization.

660202985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6392 (or 3205 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 660202985 is about 25694.4154438275. The cubic root of 660202985 is about 870.7480178827.

The spelling of 660202985 in words is "six hundred sixty million, two hundred two thousand, nine hundred eighty-five".