1660485789 has 12 divisors (see below), whose sum is σ = 2404650300. Its totient is φ = 1104142464.

The previous prime is 1660485769. The next prime is 1660485821. The reversal of 1660485789 is 9875840661.

1660485789 is a `hidden beast` number, since 1 + 6 + 60 + 4 + 8 + 578 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 142993764 + 1517492025 = 11958^2 + 38955^2 .

It is not a de Polignac number, because 1660485789 - 2¹⁶ = 1660420253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660485709) 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, 233644 + ... + 240645.

It is an arithmetic number, because the mean of its divisors is an integer number (200387525).

Almost surely, 2^1660485789 is an apocalyptic number.

It is an amenable number.

1660485789 is a deficient number, since it is larger than the sum of its proper divisors (744164511).

1660485789 is a wasteful number, since it uses less digits than its factorization.

1660485789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474684 (or 474681 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 1660485789 is about 40749.0587498656. The cubic root of 1660485789 is about 1184.1636377970.

The spelling of 1660485789 in words is "one billion, six hundred sixty million, four hundred eighty-five thousand, seven hundred eighty-nine".