66845887 has 8 divisors (see below), whose sum is σ = 70934400. Its totient is φ = 62774784.

The previous prime is 66845839. The next prime is 66845903. The reversal of 66845887 is 78854866.

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

It is a cyclic number.

It is not a de Polignac number, because 66845887 - 2¹¹ = 66843839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66845837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4039 + ... + 12247.

It is an arithmetic number, because the mean of its divisors is an integer number (8866800).

Almost surely, 2^66845887 is an apocalyptic number.

66845887 is a deficient number, since it is larger than the sum of its proper divisors (4088513).

66845887 is a wasteful number, since it uses less digits than its factorization.

66845887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705.

The product of its digits is 2580480, while the sum is 52.

The square root of 66845887 is about 8175.9334023706. The cubic root of 66845887 is about 405.8431593468.

The spelling of 66845887 in words is "sixty-six million, eight hundred forty-five thousand, eight hundred eighty-seven".