66595031905 has 8 divisors (see below), whose sum is σ = 80166134952. Its totient is φ = 53107961088.

The previous prime is 66595031897. The next prime is 66595031917. The reversal of 66595031905 is 50913059566.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 76947984 + 66518083921 = 8772^2 + 257911^2 .

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 66595031905 - 2³ = 66595031897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 21006312 + ... + 21009481.

It is an arithmetic number, because the mean of its divisors is an integer number (10020766869).

Almost surely, 2^66595031905 is an apocalyptic number.

It is an amenable number.

66595031905 is a deficient number, since it is larger than the sum of its proper divisors (13571103047).

66595031905 is a wasteful number, since it uses less digits than its factorization.

66595031905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42016115.

The product of its (nonzero) digits is 1093500, while the sum is 49.

The spelling of 66595031905 in words is "sixty-six billion, five hundred ninety-five million, thirty-one thousand, nine hundred five".