66280025 has 24 divisors (see below), whose sum is σ = 99457920. Its totient is φ = 42773760.

The previous prime is 66280021. The next prime is 66280079. The reversal of 66280025 is 52008266.

It is not a de Polignac number, because 66280025 - 2² = 66280021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66280025.

It is not an unprimeable number, because it can be changed into a prime (66280021) 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, 8165 + ... + 14114.

It is an arithmetic number, because the mean of its divisors is an integer number (4144080).

Almost surely, 2^66280025 is an apocalyptic number.

It is an amenable number.

66280025 is a deficient number, since it is larger than the sum of its proper divisors (33177895).

66280025 is a wasteful number, since it uses less digits than its factorization.

66280025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22313 (or 22308 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 66280025 is about 8141.2545102091. The cubic root of 66280025 is about 404.6947351658.

The spelling of 66280025 in words is "sixty-six million, two hundred eighty thousand, twenty-five".