1660208818 has 16 divisors (see below), whose sum is σ = 2592880920. Its totient is φ = 796579200.

The previous prime is 1660208789. The next prime is 1660208819. The reversal of 1660208818 is 8188020661.

It can be written as a sum of positive squares in 4 ways, for example, as 292170649 + 1368038169 = 17093^2 + 36987^2 .

It is not an unprimeable number, because it can be changed into a prime (1660208819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160953 + ... + 170956.

Almost surely, 2^1660208818 is an apocalyptic number.

1660208818 is a deficient number, since it is larger than the sum of its proper divisors (932672102).

1660208818 is a wasteful number, since it uses less digits than its factorization.

1660208818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332013.

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 1660208818 is about 40745.6601124586. The cubic root of 1660208818 is about 1184.0977941693.

The spelling of 1660208818 in words is "one billion, six hundred sixty million, two hundred eight thousand, eight hundred eighteen".