51666071705 has 4 divisors (see below), whose sum is σ = 61999286052. Its totient is φ = 41332857360.

The previous prime is 51666071683. The next prime is 51666071753. The reversal of 51666071705 is 50717066615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24420937984 + 27245133721 = 156272^2 + 165061^2 .

It is not a de Polignac number, because 51666071705 - 2¹⁴ = 51666055321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5166607166 + ... + 5166607175.

It is an arithmetic number, because the mean of its divisors is an integer number (15499821513).

Almost surely, 2^51666071705 is an apocalyptic number.

It is an amenable number.

51666071705 is a deficient number, since it is larger than the sum of its proper divisors (10333214347).

51666071705 is a wasteful number, since it uses less digits than its factorization.

51666071705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10333214346.

The product of its (nonzero) digits is 264600, while the sum is 44.

The spelling of 51666071705 in words is "fifty-one billion, six hundred sixty-six million, seventy-one thousand, seven hundred five".