1664549897192 has 128 divisors (see below), whose sum is σ = 3862221834240. Its totient is φ = 654915905280.

The previous prime is 1664549897191. The next prime is 1664549897207. The reversal of 1664549897192 is 2917989454661.

It is not an unprimeable number, because it can be changed into a prime (1664549897191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283711043 + ... + 283716909.

It is an arithmetic number, because the mean of its divisors is an integer number (30173608080).

Almost surely, 2^{1664549897192} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1664549897192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1931110917120).

1664549897192 is an abundant number, since it is smaller than the sum of its proper divisors (2197671937048).

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

1664549897192 is a wasteful number, since it uses less digits than its factorization.

1664549897192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7951 (or 7947 counting only the distinct ones).

The product of its digits is 235146240, while the sum is 71.

The spelling of 1664549897192 in words is "one trillion, six hundred sixty-four billion, five hundred forty-nine million, eight hundred ninety-seven thousand, one hundred ninety-two".