1664542445028 has 48 divisors (see below), whose sum is σ = 3933495552000. Its totient is φ = 547768454688.

The previous prime is 1664542445021. The next prime is 1664542445047. The reversal of 1664542445028 is 8205442454661.

It is not an unprimeable number, because it can be changed into a prime (1664542445021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9831193 + ... + 9999071.

It is an arithmetic number, because the mean of its divisors is an integer number (81947824000).

Almost surely, 2^{1664542445028} is an apocalyptic number.

It is an amenable number.

1664542445028 is an abundant number, since it is smaller than the sum of its proper divisors (2268953106972).

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

1664542445028 is a wasteful number, since it uses less digits than its factorization.

1664542445028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178424 (or 178422 counting only the distinct ones).

The product of its (nonzero) digits is 7372800, while the sum is 51.

Adding to 1664542445028 its reverse (8205442454661), we get a palindrome (9869984899689).

The spelling of 1664542445028 in words is "one trillion, six hundred sixty-four billion, five hundred forty-two million, four hundred forty-five thousand, twenty-eight".