51059436639 has 4 divisors (see below), whose sum is σ = 68079248856. Its totient is φ = 34039624424.

The previous prime is 51059436559. The next prime is 51059436721. The reversal of 51059436639 is 93663495015.

It is a happy number.

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 51059436639 - 2⁷ = 51059436511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51059436591 and 51059436600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51059434639) 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, 8509906104 + ... + 8509906109.

It is an arithmetic number, because the mean of its divisors is an integer number (17019812214).

Almost surely, 2^51059436639 is an apocalyptic number.

51059436639 is a deficient number, since it is larger than the sum of its proper divisors (17019812217).

51059436639 is a wasteful number, since it uses less digits than its factorization.

51059436639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17019812216.

The product of its (nonzero) digits is 2624400, while the sum is 51.

The spelling of 51059436639 in words is "fifty-one billion, fifty-nine million, four hundred thirty-six thousand, six hundred thirty-nine".