66408785 has 8 divisors (see below), whose sum is σ = 80813376. Its totient is φ = 52378480.

The previous prime is 66408761. The next prime is 66408877. The reversal of 66408785 is 58780466.

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

It is not a de Polignac number, because 66408785 - 2¹⁴ = 66392401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93179 + ... + 93888.

It is an arithmetic number, because the mean of its divisors is an integer number (10101672).

Almost surely, 2^66408785 is an apocalyptic number.

It is an amenable number.

66408785 is a deficient number, since it is larger than the sum of its proper divisors (14404591).

66408785 is a wasteful number, since it uses less digits than its factorization.

66408785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187143.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66408785 is about 8149.1585455187. The cubic root of 66408785 is about 404.9566279825.

The spelling of 66408785 in words is "sixty-six million, four hundred eight thousand, seven hundred eighty-five".