665061125 has 16 divisors (see below), whose sum is σ = 852434544. Its totient is φ = 517665600.

The previous prime is 665061121. The next prime is 665061127. The reversal of 665061125 is 521160566.

It can be written as a sum of positive squares in 8 ways, for example, as 277089316 + 387971809 = 16646^2 + 19697^2 .

It is not a de Polignac number, because 665061125 - 2² = 665061121 is a prime.

It is a super-3 number, since 3×665061125³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665061091 and 665061100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665061121) 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, 67274 + ... + 76523.

It is an arithmetic number, because the mean of its divisors is an integer number (53277159).

Almost surely, 2^665061125 is an apocalyptic number.

It is an amenable number.

665061125 is a deficient number, since it is larger than the sum of its proper divisors (187373419).

665061125 is a wasteful number, since it uses less digits than its factorization.

665061125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143849 (or 143839 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 665061125 is about 25788.7790521382. The cubic root of 665061125 is about 872.8786160931.

The spelling of 665061125 in words is "six hundred sixty-five million, sixty-one thousand, one hundred twenty-five".