51407009865 has 24 divisors (see below), whose sum is σ = 91513743048. Its totient is φ = 26676069120.

The previous prime is 51407009813. The next prime is 51407009867. The reversal of 51407009865 is 56890070415.

51407009865 is a `hidden beast` number, since 514 + 0 + 70 + 0 + 9 + 8 + 65 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 18451690569 + 32955319296 = 135837^2 + 181536^2 .

It is not a de Polignac number, because 51407009865 - 2⁷ = 51407009737 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51407009865.

It is not an unprimeable number, because it can be changed into a prime (51407009867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15435876 + ... + 15439205.

It is an arithmetic number, because the mean of its divisors is an integer number (3813072627).

Almost surely, 2^51407009865 is an apocalyptic number.

It is an amenable number.

51407009865 is a deficient number, since it is larger than the sum of its proper divisors (40106733183).

51407009865 is a wasteful number, since it uses less digits than its factorization.

51407009865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30875129 (or 30875126 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 51407009865 in words is "fifty-one billion, four hundred seven million, nine thousand, eight hundred sixty-five".