51784208689 has 4 divisors (see below), whose sum is σ = 52988492656. Its totient is φ = 50579924724.

The previous prime is 51784208683. The next prime is 51784208741. The reversal of 51784208689 is 98680248715.

It is a happy number.

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 not a de Polignac number, because 51784208689 - 2³ = 51784208681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51784208681) 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, 602141919 + ... + 602142004.

It is an arithmetic number, because the mean of its divisors is an integer number (13247123164).

Almost surely, 2^51784208689 is an apocalyptic number.

It is an amenable number.

51784208689 is a deficient number, since it is larger than the sum of its proper divisors (1204283967).

51784208689 is a wasteful number, since it uses less digits than its factorization.

51784208689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204283966.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 51784208689 in words is "fifty-one billion, seven hundred eighty-four million, two hundred eight thousand, six hundred eighty-nine".