66631607 has 8 divisors (see below), whose sum is σ = 76288800. Its totient is φ = 57009024.

The previous prime is 66631603. The next prime is 66631633. The reversal of 66631607 is 70613666.

It is a happy number.

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 66631607 - 2² = 66631603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66631603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4382 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (9536100).

Almost surely, 2^66631607 is an apocalyptic number.

66631607 is a deficient number, since it is larger than the sum of its proper divisors (9657193).

66631607 is a wasteful number, since it uses less digits than its factorization.

66631607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17305.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 66631607 is about 8162.8185695873. The cubic root of 66631607 is about 405.4090405829.

The spelling of 66631607 in words is "sixty-six million, six hundred thirty-one thousand, six hundred seven".