66601685 has 8 divisors (see below), whose sum is σ = 81115296. Its totient is φ = 52485840.

The previous prime is 66601681. The next prime is 66601687. The reversal of 66601685 is 58610666.

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

It is not a de Polignac number, because 66601685 - 2² = 66601681 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 (66601681) 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, 99071 + ... + 99740.

It is an arithmetic number, because the mean of its divisors is an integer number (10139412).

Almost surely, 2^66601685 is an apocalyptic number.

It is an amenable number.

66601685 is a deficient number, since it is larger than the sum of its proper divisors (14513611).

66601685 is a wasteful number, since it uses less digits than its factorization.

66601685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198883.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66601685 is about 8160.9855409748. The cubic root of 66601685 is about 405.3483463361.

The spelling of 66601685 in words is "sixty-six million, six hundred one thousand, six hundred eighty-five".