660281661 has 24 divisors (see below), whose sum is σ = 1033073496. Its totient is φ = 403966080.

The previous prime is 660281651. The next prime is 660281681. The reversal of 660281661 is 166182066.

It can be written as a sum of positive squares in 4 ways, for example, as 143856036 + 516425625 = 11994^2 + 22725^2 .

It is not a de Polignac number, because 660281661 - 2⁷ = 660281533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660281621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3931 + ... + 36551.

It is an arithmetic number, because the mean of its divisors is an integer number (43044729).

Almost surely, 2^660281661 is an apocalyptic number.

It is an amenable number.

660281661 is a deficient number, since it is larger than the sum of its proper divisors (372791835).

660281661 is a wasteful number, since it uses less digits than its factorization.

660281661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32813 (or 32810 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 660281661 is about 25695.9463923787. The cubic root of 660281661 is about 870.7826053512.

The spelling of 660281661 in words is "six hundred sixty million, two hundred eighty-one thousand, six hundred sixty-one".