66080971585 has 8 divisors (see below), whose sum is σ = 81440332776. Its totient is φ = 51435999360.

The previous prime is 66080971559. The next prime is 66080971613. The reversal of 66080971585 is 58517908066.

It can be written as a sum of positive squares in 4 ways, for example, as 12601634049 + 53479337536 = 112257^2 + 231256^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-66080971585 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178597036 + ... + 178597405.

It is an arithmetic number, because the mean of its divisors is an integer number (10180041597).

Almost surely, 2^66080971585 is an apocalyptic number.

It is an amenable number.

66080971585 is a deficient number, since it is larger than the sum of its proper divisors (15359361191).

66080971585 is a wasteful number, since it uses less digits than its factorization.

66080971585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357194483.

The product of its (nonzero) digits is 3628800, while the sum is 55.

The spelling of 66080971585 in words is "sixty-six billion, eighty million, nine hundred seventy-one thousand, five hundred eighty-five".