660251285 has 4 divisors (see below), whose sum is σ = 792301548. Its totient is φ = 528201024.

The previous prime is 660251281. The next prime is 660251341. The reversal of 660251285 is 582152066.

660251285 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 308388721 + 351862564 = 17561^2 + 18758^2 .

It is a cyclic number.

It is not a de Polignac number, because 660251285 - 2² = 660251281 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 (660251281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66025124 + ... + 66025133.

It is an arithmetic number, because the mean of its divisors is an integer number (198075387).

Almost surely, 2^660251285 is an apocalyptic number.

It is an amenable number.

660251285 is a deficient number, since it is larger than the sum of its proper divisors (132050263).

660251285 is a wasteful number, since it uses less digits than its factorization.

660251285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132050262.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 660251285 is about 25695.3553195903. The cubic root of 660251285 is about 870.7692518085.

The spelling of 660251285 in words is "six hundred sixty million, two hundred fifty-one thousand, two hundred eighty-five".