1801765025 has 6 divisors (see below), whose sum is σ = 2234188662. Its totient is φ = 1441412000.

The previous prime is 1801765019. The next prime is 1801765093. The reversal of 1801765025 is 5205671081.

It can be written as a sum of positive squares in 3 ways, for example, as 222815329 + 1578949696 = 14927^2 + 39736^2 .

It is not a de Polignac number, because 1801765025 - 2¹⁰ = 1801764001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36035276 + ... + 36035325.

It is an arithmetic number, because the mean of its divisors is an integer number (372364777).

Almost surely, 2^1801765025 is an apocalyptic number.

It is an amenable number.

1801765025 is a deficient number, since it is larger than the sum of its proper divisors (432423637).

1801765025 is an equidigital number, since it uses as much as digits as its factorization.

1801765025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72070611 (or 72070606 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 35.

The square root of 1801765025 is about 42447.2027935882. The cubic root of 1801765025 is about 1216.8378706556.

The spelling of 1801765025 in words is "one billion, eight hundred one million, seven hundred sixty-five thousand, twenty-five".