51378474134173 has 4 divisors (see below), whose sum is σ = 52102114615008. Its totient is φ = 50654833653340.

The previous prime is 51378474134167. The next prime is 51378474134209. The reversal of 51378474134173 is 37143147487315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51378474134173 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51378474134473) 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, 361820240311 + ... + 361820240452.

It is an arithmetic number, because the mean of its divisors is an integer number (13025528653752).

Almost surely, 2^{51378474134173} is an apocalyptic number.

It is an amenable number.

51378474134173 is a deficient number, since it is larger than the sum of its proper divisors (723640480835).

51378474134173 is an equidigital number, since it uses as much as digits as its factorization.

51378474134173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723640480834.

The product of its digits is 23708160, while the sum is 58.

The spelling of 51378474134173 in words is "fifty-one trillion, three hundred seventy-eight billion, four hundred seventy-four million, one hundred thirty-four thousand, one hundred seventy-three".