66625670617 has 24 divisors (see below), whose sum is σ = 78173484480. Its totient is φ = 56572639200.

The previous prime is 66625670591. The next prime is 66625670627. The reversal of 66625670617 is 71607652666.

It is not a de Polignac number, because 66625670617 - 2¹¹ = 66625668569 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66625670627) 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 23 ways as a sum of consecutive naturals, for example, 40858 + ... + 367315.

It is an arithmetic number, because the mean of its divisors is an integer number (3257228520).

Almost surely, 2^66625670617 is an apocalyptic number.

It is an amenable number.

66625670617 is a deficient number, since it is larger than the sum of its proper divisors (11547813863).

66625670617 is a wasteful number, since it uses less digits than its factorization.

66625670617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408285 (or 408274 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 66625670617 in words is "sixty-six billion, six hundred twenty-five million, six hundred seventy thousand, six hundred seventeen".