66566546207 has 12 divisors (see below), whose sum is σ = 77524330176. Its totient is φ = 56990888640.

The previous prime is 66566546201. The next prime is 66566546237. The reversal of 66566546207 is 70264566566.

It is not a de Polignac number, because 66566546207 - 2⁸ = 66566545951 is a prime.

It is a super-2 number, since 2×66566546207² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566546201) 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, 744794 + ... + 829367.

It is an arithmetic number, because the mean of its divisors is an integer number (6460360848).

Almost surely, 2^66566546207 is an apocalyptic number.

66566546207 is a deficient number, since it is larger than the sum of its proper divisors (10957783969).

66566546207 is a wasteful number, since it uses less digits than its factorization.

66566546207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575038 (or 1575031 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 53.

The spelling of 66566546207 in words is "sixty-six billion, five hundred sixty-six million, five hundred forty-six thousand, two hundred seven".