66072865 has 8 divisors (see below), whose sum is σ = 79774848. Its totient is φ = 52533360.

The previous prime is 66072841. The next prime is 66072869. The reversal of 66072865 is 56827066.

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

It is not a de Polignac number, because 66072865 - 2⁵ = 66072833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66072869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39721 + ... + 41350.

It is an arithmetic number, because the mean of its divisors is an integer number (9971856).

Almost surely, 2^66072865 is an apocalyptic number.

It is an amenable number.

66072865 is a deficient number, since it is larger than the sum of its proper divisors (13701983).

66072865 is a wasteful number, since it uses less digits than its factorization.

66072865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81239.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 66072865 is about 8128.5216983164. The cubic root of 66072865 is about 404.2726670400.

The spelling of 66072865 in words is "sixty-six million, seventy-two thousand, eight hundred sixty-five".