66907685 has 8 divisors (see below), whose sum is σ = 86465400. Its totient is φ = 49408704.

The previous prime is 66907657. The next prime is 66907691. The reversal of 66907685 is 58670966.

It can be written as a sum of positive squares in 4 ways, for example, as 4592449 + 62315236 = 2143^2 + 7894^2 .

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 66907685 - 2²⁰ = 65859109 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514610 + ... + 514739.

It is an arithmetic number, because the mean of its divisors is an integer number (10808175).

Almost surely, 2^66907685 is an apocalyptic number.

66907685 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66907685 is a deficient number, since it is larger than the sum of its proper divisors (19557715).

66907685 is a wasteful number, since it uses less digits than its factorization.

66907685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029367.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 66907685 is about 8179.7117919888. The cubic root of 66907685 is about 405.9681860905.

The spelling of 66907685 in words is "sixty-six million, nine hundred seven thousand, six hundred eighty-five".