66686855075 has 12 divisors (see below), whose sum is σ = 82699016448. Its totient is φ = 53344764000.

The previous prime is 66686855071. The next prime is 66686855107. The reversal of 66686855075 is 57055868666.

It is not a de Polignac number, because 66686855075 - 2² = 66686855071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66686854999 and 66686855017.

It is not an unprimeable number, because it can be changed into a prime (66686855071) 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, 185525 + ... + 409625.

It is an arithmetic number, because the mean of its divisors is an integer number (6891584704).

Almost surely, 2^66686855075 is an apocalyptic number.

66686855075 is a deficient number, since it is larger than the sum of its proper divisors (16012161373).

66686855075 is a wasteful number, since it uses less digits than its factorization.

66686855075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236014 (or 236009 counting only the distinct ones).

The product of its (nonzero) digits is 72576000, while the sum is 62.

The spelling of 66686855075 in words is "sixty-six billion, six hundred eighty-six million, eight hundred fifty-five thousand, seventy-five".