51320071671 has 8 divisors (see below), whose sum is σ = 74647377024. Its totient is φ = 31103073720.

The previous prime is 51320071643. The next prime is 51320071679. The reversal of 51320071671 is 17617002315.

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

It is not a de Polignac number, because 51320071671 - 2¹⁷ = 51319940599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1555153687 = 51320071671 / (5 + 1 + 3 + 2 + 0 + 0 + 7 + 1 + 6 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51320071679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777576811 + ... + 777576876.

It is an arithmetic number, because the mean of its divisors is an integer number (9330922128).

Almost surely, 2^51320071671 is an apocalyptic number.

51320071671 is a deficient number, since it is larger than the sum of its proper divisors (23327305353).

51320071671 is a wasteful number, since it uses less digits than its factorization.

51320071671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555153701.

The product of its (nonzero) digits is 8820, while the sum is 33.

Adding to 51320071671 its reverse (17617002315), we get a palindrome (68937073986).

The spelling of 51320071671 in words is "fifty-one billion, three hundred twenty million, seventy-one thousand, six hundred seventy-one".