66280857 has 8 divisors (see below), whose sum is σ = 90254976. Its totient is φ = 43246992.

The previous prime is 66280783. The next prime is 66280859. The reversal of 66280857 is 75808266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66280857 - 2⁸ = 66280601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66280859) 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 7 ways as a sum of consecutive naturals, for example, 234898 + ... + 235179.

It is an arithmetic number, because the mean of its divisors is an integer number (11281872).

Almost surely, 2^66280857 is an apocalyptic number.

It is an amenable number.

66280857 is a deficient number, since it is larger than the sum of its proper divisors (23974119).

66280857 is a wasteful number, since it uses less digits than its factorization.

66280857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470127.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 66280857 is about 8141.3056078248. The cubic root of 66280857 is about 404.6964285096.

The spelling of 66280857 in words is "sixty-six million, two hundred eighty thousand, eight hundred fifty-seven".