66560025 has 24 divisors (see below), whose sum is σ = 125767744. Its totient is φ = 30427200.

The previous prime is 66560023. The next prime is 66560029. The reversal of 66560025 is 52006566.

It is not a de Polignac number, because 66560025 - 2¹ = 66560023 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 = 66559974 and 66560001.

It is not an unprimeable number, because it can be changed into a prime (66560023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62866 + ... + 63915.

Almost surely, 2^66560025 is an apocalyptic number.

It is an amenable number.

66560025 is a deficient number, since it is larger than the sum of its proper divisors (59207719).

66560025 is a wasteful number, since it uses less digits than its factorization.

66560025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126801 (or 126796 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66560025 is about 8158.4327539056. The cubic root of 66560025 is about 405.2638122672.

The spelling of 66560025 in words is "sixty-six million, five hundred sixty thousand, twenty-five".