66425525 has 12 divisors (see below), whose sum is σ = 82523364. Its totient is φ = 53040000.

The previous prime is 66425473. The next prime is 66425531. The reversal of 66425525 is 52552466.

It can be written as a sum of positive squares in 6 ways, for example, as 3334276 + 63091249 = 1826^2 + 7943^2 .

It is not a de Polignac number, because 66425525 - 2⁸ = 66425269 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12815 + ... + 17235.

It is an arithmetic number, because the mean of its divisors is an integer number (6876947).

Almost surely, 2^66425525 is an apocalyptic number.

It is an amenable number.

66425525 is a deficient number, since it is larger than the sum of its proper divisors (16097839).

66425525 is a wasteful number, since it uses less digits than its factorization.

66425525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5032 (or 5027 counting only the distinct ones).

The product of its digits is 72000, while the sum is 35.

The square root of 66425525 is about 8150.1855807092. The cubic root of 66425525 is about 404.9906516157.

It can be divided in two parts, 6642 and 5525, that added together give a cube (12167 = 23³).

The spelling of 66425525 in words is "sixty-six million, four hundred twenty-five thousand, five hundred twenty-five".