66537425 has 6 divisors (see below), whose sum is σ = 82506438. Its totient is φ = 53229920.

The previous prime is 66537421. The next prime is 66537461. The reversal of 66537425 is 52473566.

It can be written as a sum of positive squares in 3 ways, for example, as 17032129 + 49505296 = 4127^2 + 7036^2 .

It is not a de Polignac number, because 66537425 - 2² = 66537421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66537421) by changing a digit.

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, 1330724 + ... + 1330773.

It is an arithmetic number, because the mean of its divisors is an integer number (13751073).

Almost surely, 2^66537425 is an apocalyptic number.

It is an amenable number.

66537425 is a deficient number, since it is larger than the sum of its proper divisors (15969013).

66537425 is a wasteful number, since it uses less digits than its factorization.

66537425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2661507 (or 2661502 counting only the distinct ones).

The product of its digits is 151200, while the sum is 38.

The square root of 66537425 is about 8157.0475663686. The cubic root of 66537425 is about 405.2179388922.

The spelling of 66537425 in words is "sixty-six million, five hundred thirty-seven thousand, four hundred twenty-five".