66025281 has 16 divisors (see below), whose sum is σ = 101650304. Its totient is φ = 37338624.

The previous prime is 66025231. The next prime is 66025291. The reversal of 66025281 is 18252066.

It is not a de Polignac number, because 66025281 - 2⁷ = 66025153 is a prime.

It is a super-2 number, since 2×66025281² = 8718675462257922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66025231) 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 15 ways as a sum of consecutive naturals, for example, 14170 + ... + 18243.

It is an arithmetic number, because the mean of its divisors is an integer number (6353144).

Almost surely, 2^66025281 is an apocalyptic number.

It is an amenable number.

66025281 is a deficient number, since it is larger than the sum of its proper divisors (35625023).

66025281 is a wasteful number, since it uses less digits than its factorization.

66025281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32520.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 66025281 is about 8125.5941936575. The cubic root of 66025281 is about 404.1755947627.

The spelling of 66025281 in words is "sixty-six million, twenty-five thousand, two hundred eighty-one".