51839586665 has 4 divisors (see below), whose sum is σ = 62207504004. Its totient is φ = 41471669328.

The previous prime is 51839586653. The next prime is 51839586709. The reversal of 51839586665 is 56668593815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5430363481 + 46409223184 = 73691^2 + 215428^2 .

It is a cyclic number.

It is not a de Polignac number, because 51839586665 - 2⁴ = 51839586649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51839586598 and 51839586607.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5183958662 + ... + 5183958671.

It is an arithmetic number, because the mean of its divisors is an integer number (15551876001).

Almost surely, 2^51839586665 is an apocalyptic number.

It is an amenable number.

51839586665 is a deficient number, since it is larger than the sum of its proper divisors (10367917339).

51839586665 is a wasteful number, since it uses less digits than its factorization.

51839586665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10367917338.

The product of its digits is 46656000, while the sum is 62.

The spelling of 51839586665 in words is "fifty-one billion, eight hundred thirty-nine million, five hundred eighty-six thousand, six hundred sixty-five".