1665003122500 has 135 divisors (see below), whose sum is σ = 3687754194817. Its totient is φ = 657562360000.

The previous prime is 1665003122459. The next prime is 1665003122501. The reversal of 1665003122500 is 52213005661.

The square root of 1665003122500 is 1290350.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 284829285636 + 1380173836864 = 533694^2 + 1174808^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665003122501) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8451792402 + ... + 8451792598.

Almost surely, 2^{1665003122500} is an apocalyptic number.

1665003122500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665003122500 is the 1290350-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665003122500

1665003122500 is an abundant number, since it is smaller than the sum of its proper divisors (2022751072317).

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

1665003122500 is an frugal number, since it uses more digits than its factorization.

1665003122500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 1665003122500 in words is "one trillion, six hundred sixty-five billion, three million, one hundred twenty-two thousand, five hundred".