66666607 has 12 divisors (see below), whose sum is σ = 78427440. Its totient is φ = 56497056.

The previous prime is 66666569. The next prime is 66666629. The reversal of 66666607 is 70666666.

It is a de Polignac number, because none of the positive numbers 2^k-66666607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66666667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3283 + ... + 12004.

It is an arithmetic number, because the mean of its divisors is an integer number (6535620).

Almost surely, 2^66666607 is an apocalyptic number.

66666607 is a deficient number, since it is larger than the sum of its proper divisors (11760833).

66666607 is a wasteful number, since it uses less digits than its factorization.

66666607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15390 (or 15383 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 43.

The square root of 66666607 is about 8164.9621554542. The cubic root of 66666607 is about 405.4800120700.

The spelling of 66666607 in words is "sixty-six million, six hundred sixty-six thousand, six hundred seven".