1660339138 has 16 divisors (see below), whose sum is σ = 2523096576. Its totient is φ = 819327600.

The previous prime is 1660339123. The next prime is 1660339139. The reversal of 1660339138 is 8319330661.

It is a self number, because there is not a number n which added to its sum of digits gives 1660339138.

It is not an unprimeable number, because it can be changed into a prime (1660339139) 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, 176863 + ... + 186013.

It is an arithmetic number, because the mean of its divisors is an integer number (157693536).

Almost surely, 2^1660339138 is an apocalyptic number.

1660339138 is a deficient number, since it is larger than the sum of its proper divisors (862757438).

1660339138 is a wasteful number, since it uses less digits than its factorization.

1660339138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10329.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 1660339138 is about 40747.2592697963. The cubic root of 1660339138 is about 1184.1287757312.

Adding to 1660339138 its reverse (8319330661), we get a palindrome (9979669799).

The spelling of 1660339138 in words is "one billion, six hundred sixty million, three hundred thirty-nine thousand, one hundred thirty-eight".