51550303687 has 4 divisors (see below), whose sum is σ = 52943555176. Its totient is φ = 50157052200.

The previous prime is 51550303661. The next prime is 51550303703. The reversal of 51550303687 is 78630305515.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51550303687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550303657) 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, 696625689 + ... + 696625762.

It is an arithmetic number, because the mean of its divisors is an integer number (13235888794).

Almost surely, 2^51550303687 is an apocalyptic number.

51550303687 is a deficient number, since it is larger than the sum of its proper divisors (1393251489).

51550303687 is a wasteful number, since it uses less digits than its factorization.

51550303687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393251488.

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 51550303687 in words is "fifty-one billion, five hundred fifty million, three hundred three thousand, six hundred eighty-seven".