66121325 has 6 divisors (see below), whose sum is σ = 81990474. Its totient is φ = 52897040.

The previous prime is 66121309. The next prime is 66121351. The reversal of 66121325 is 52312166.

It can be written as a sum of positive squares in 3 ways, for example, as 10484644 + 55636681 = 3238^2 + 7459^2 .

It is not a de Polignac number, because 66121325 - 2⁴ = 66121309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66121294 and 66121303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1322402 + ... + 1322451.

It is an arithmetic number, because the mean of its divisors is an integer number (13665079).

Almost surely, 2^66121325 is an apocalyptic number.

It is an amenable number.

66121325 is a deficient number, since it is larger than the sum of its proper divisors (15869149).

66121325 is a wasteful number, since it uses less digits than its factorization.

66121325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2644863 (or 2644858 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 66121325 is about 8131.5020137733. The cubic root of 66121325 is about 404.3714784851.

The spelling of 66121325 in words is "sixty-six million, one hundred twenty-one thousand, three hundred twenty-five".