51778673543 has 4 divisors (see below), whose sum is σ = 52077972408. Its totient is φ = 51479374680.

The previous prime is 51778673519. The next prime is 51778673563. The reversal of 51778673543 is 34537687715.

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

It is a cyclic number.

It is not a de Polignac number, because 51778673543 - 2¹⁴ = 51778657159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51778673563) 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, 149649173 + ... + 149649518.

It is an arithmetic number, because the mean of its divisors is an integer number (13019493102).

Almost surely, 2^51778673543 is an apocalyptic number.

51778673543 is a deficient number, since it is larger than the sum of its proper divisors (299298865).

51778673543 is a wasteful number, since it uses less digits than its factorization.

51778673543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299298864.

The product of its digits is 14817600, while the sum is 56.

The spelling of 51778673543 in words is "fifty-one billion, seven hundred seventy-eight million, six hundred seventy-three thousand, five hundred forty-three".