51287805007 has 4 divisors (see below), whose sum is σ = 51404634160. Its totient is φ = 51170975856.

The previous prime is 51287805001. The next prime is 51287805031. The reversal of 51287805007 is 70050878215.

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 51287805007 - 2¹⁹ = 51287280719 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 (51287805001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58413918 + ... + 58414795.

It is an arithmetic number, because the mean of its divisors is an integer number (12851158540).

Almost surely, 2^51287805007 is an apocalyptic number.

51287805007 is a deficient number, since it is larger than the sum of its proper divisors (116829153).

51287805007 is a wasteful number, since it uses less digits than its factorization.

51287805007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116829152.

The product of its (nonzero) digits is 156800, while the sum is 43.

The spelling of 51287805007 in words is "fifty-one billion, two hundred eighty-seven million, eight hundred five thousand, seven".