51161278827 has 4 divisors (see below), whose sum is σ = 68215038440. Its totient is φ = 34107519216.

The previous prime is 51161278811. The next prime is 51161278849. The reversal of 51161278827 is 72887216115.

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

It is not a de Polignac number, because 51161278827 - 2⁴ = 51161278811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51161278627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8526879802 + ... + 8526879807.

It is an arithmetic number, because the mean of its divisors is an integer number (17053759610).

Almost surely, 2^51161278827 is an apocalyptic number.

51161278827 is a deficient number, since it is larger than the sum of its proper divisors (17053759613).

51161278827 is a wasteful number, since it uses less digits than its factorization.

51161278827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17053759612.

The product of its digits is 376320, while the sum is 48.

The spelling of 51161278827 in words is "fifty-one billion, one hundred sixty-one million, two hundred seventy-eight thousand, eight hundred twenty-seven".