51066878105 has 4 divisors (see below), whose sum is σ = 61280253732. Its totient is φ = 40853502480.

The previous prime is 51066878077. The next prime is 51066878111. The reversal of 51066878105 is 50187866015.

It is a happy number.

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 18252280201 + 32814597904 = 135101^2 + 181148^2 .

It is not a de Polignac number, because 51066878105 - 2¹⁸ = 51066615961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51066878105.

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, 5106687806 + ... + 5106687815.

It is an arithmetic number, because the mean of its divisors is an integer number (15320063433).

Almost surely, 2^51066878105 is an apocalyptic number.

It is an amenable number.

51066878105 is a deficient number, since it is larger than the sum of its proper divisors (10213375627).

51066878105 is a wasteful number, since it uses less digits than its factorization.

51066878105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10213375626.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 51066878105 in words is "fifty-one billion, sixty-six million, eight hundred seventy-eight thousand, one hundred five".