1660866085 has 16 divisors (see below), whose sum is σ = 2111281200. Its totient is φ = 1249939456.

The previous prime is 1660866073. The next prime is 1660866121. The reversal of 1660866085 is 5806680661.

It can be written as a sum of positive squares in 8 ways, for example, as 2259009 + 1658607076 = 1503^2 + 40726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660866085 - 2¹⁹ = 1660341797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269721 + ... + 275809.

It is an arithmetic number, because the mean of its divisors is an integer number (131955075).

Almost surely, 2^1660866085 is an apocalyptic number.

It is an amenable number.

1660866085 is a deficient number, since it is larger than the sum of its proper divisors (450415115).

1660866085 is a wasteful number, since it uses less digits than its factorization.

1660866085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9320.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 1660866085 is about 40753.7247990905. The cubic root of 1660866085 is about 1184.2540326928.

The spelling of 1660866085 in words is "one billion, six hundred sixty million, eight hundred sixty-six thousand, eighty-five".