66777956185 has 8 divisors (see below), whose sum is σ = 80139938760. Its totient is φ = 53418104064.

The previous prime is 66777956159. The next prime is 66777956249. The reversal of 66777956185 is 58165977766.

It can be written as a sum of positive squares in 4 ways, for example, as 2593253776 + 64184702409 = 50924^2 + 253347^2 .

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 66777956185 - 2¹¹ = 66777954137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66777956185.

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, 462822 + ... + 589711.

It is an arithmetic number, because the mean of its divisors is an integer number (10017492345).

Almost surely, 2^66777956185 is an apocalyptic number.

It is an amenable number.

66777956185 is a deficient number, since it is larger than the sum of its proper divisors (13361982575).

66777956185 is a wasteful number, since it uses less digits than its factorization.

66777956185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065227.

The product of its digits is 133358400, while the sum is 67.

The spelling of 66777956185 in words is "sixty-six billion, seven hundred seventy-seven million, nine hundred fifty-six thousand, one hundred eighty-five".