1664704525000 has 192 divisors, whose sum is σ = 4272442796160. Its totient is φ = 603019200000.

The previous prime is 1664704524997. The next prime is 1664704525079. The reversal of 1664704525000 is 5254074661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 72313492 + ... + 72336508.

It is an arithmetic number, because the mean of its divisors is an integer number (22252306230).

Almost surely, 2^{1664704525000} is an apocalyptic number.

1664704525000 is a gapful number since it is divisible by the number (10) 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 1664704525000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2136221398080).

1664704525000 is an abundant number, since it is smaller than the sum of its proper divisors (2607738271160).

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

1664704525000 is a wasteful number, since it uses less digits than its factorization.

1664704525000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23322 (or 23298 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

Adding to 1664704525000 its reverse (5254074661), we get a palindrome (1669958599661).

The spelling of 1664704525000 in words is "one trillion, six hundred sixty-four billion, seven hundred four million, five hundred twenty-five thousand".