66504025 has 27 divisors (see below), whose sum is σ = 96342141. Its totient is φ = 45407040.

The previous prime is 66504023. The next prime is 66504041. The reversal of 66504025 is 52040566.

The square root of 66504025 is 8155.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13097161 + 53406864 = 3619^2 + 7308^2 .

It is not a de Polignac number, because 66504025 - 2¹ = 66504023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66503984 and 66504002.

It is not an unprimeable number, because it can be changed into a prime (66504023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 285309 + ... + 285541.

Almost surely, 2^66504025 is an apocalyptic number.

66504025 is the 8155-th square number.

66504025 is the 4078-th centered octagonal number.

It is an amenable number.

66504025 is a deficient number, since it is larger than the sum of its proper divisors (29838116).

66504025 is an equidigital number, since it uses as much as digits as its factorization.

66504025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The cubic root of 66504025 is about 405.1501247038.

The spelling of 66504025 in words is "sixty-six million, five hundred four thousand, twenty-five".