51213573673 has 4 divisors (see below), whose sum is σ = 52462685268. Its totient is φ = 49964462080.

The previous prime is 51213573629. The next prime is 51213573683. The reversal of 51213573673 is 37637531215.

51213573673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37637531215 = 5 ⋅7527506243.

It can be written as a sum of positive squares in 2 ways, for example, as 3503219344 + 47710354329 = 59188^2 + 218427^2 .

It is a cyclic number.

It is not a de Polignac number, because 51213573673 - 2²¹ = 51211476521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51213573683) 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, 624555736 + ... + 624555817.

It is an arithmetic number, because the mean of its divisors is an integer number (13115671317).

Almost surely, 2^51213573673 is an apocalyptic number.

It is an amenable number.

51213573673 is a deficient number, since it is larger than the sum of its proper divisors (1249111595).

51213573673 is a wasteful number, since it uses less digits than its factorization.

51213573673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249111594.

The product of its digits is 396900, while the sum is 43.

The spelling of 51213573673 in words is "fifty-one billion, two hundred thirteen million, five hundred seventy-three thousand, six hundred seventy-three".