1660040208 has 120 divisors (see below), whose sum is σ = 4988894976. Its totient is φ = 513408000.

The previous prime is 1660040201. The next prime is 1660040209. The reversal of 1660040208 is 8020400661.

1660040208 is a `hidden beast` number, since 16 + 600 + 40 + 2 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1660040201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 169033 + ... + 178583.

Almost surely, 2^1660040208 is an apocalyptic number.

1660040208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1660040208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2494447488).

1660040208 is an abundant number, since it is smaller than the sum of its proper divisors (3328854768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1660040208 is a wasteful number, since it uses less digits than its factorization.

1660040208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9653 (or 9644 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1660040208 is about 40743.5910052121. The cubic root of 1660040208 is about 1184.0577073468.

Adding to 1660040208 its reverse (8020400661), we get a palindrome (9680440869).

The spelling of 1660040208 in words is "one billion, six hundred sixty million, forty thousand, two hundred eight".