66585878 has 8 divisors (see below), whose sum is σ = 100297440. Its totient is φ = 33153400.

The previous prime is 66585877. The next prime is 66585881. The reversal of 66585878 is 87858566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66585877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69173 + ... + 70128.

It is an arithmetic number, because the mean of its divisors is an integer number (12537180).

Almost surely, 2^66585878 is an apocalyptic number.

66585878 is a deficient number, since it is larger than the sum of its proper divisors (33711562).

66585878 is a wasteful number, since it uses less digits than its factorization.

66585878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139542.

The product of its digits is 3225600, while the sum is 53.

The square root of 66585878 is about 8160.0170342959. The cubic root of 66585878 is about 405.3162758348.

The spelling of 66585878 in words is "sixty-six million, five hundred eighty-five thousand, eight hundred seventy-eight".