66810007 has 16 divisors (see below), whose sum is σ = 74856960. Its totient is φ = 59113600.

The previous prime is 66809999. The next prime is 66810013. The reversal of 66810007 is 70001866.

It is a cyclic number.

It is not a de Polignac number, because 66810007 - 2³ = 66809999 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 (66810047) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 72882 + ... + 73792.

It is an arithmetic number, because the mean of its divisors is an integer number (4678560).

Almost surely, 2^66810007 is an apocalyptic number.

66810007 is a deficient number, since it is larger than the sum of its proper divisors (8046953).

66810007 is a wasteful number, since it uses less digits than its factorization.

66810007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 66810007 is about 8173.7388629684. The cubic root of 66810007 is about 405.7705332944.

The spelling of 66810007 in words is "sixty-six million, eight hundred ten thousand, seven".