51438384228765 has 16 divisors (see below), whose sum is σ = 84052508698368. Its totient is φ = 26850106944576.

The previous prime is 51438384228757. The next prime is 51438384228769. The reversal of 51438384228765 is 56782248383415.

It is a happy number.

It is not a de Polignac number, because 51438384228765 - 2³ = 51438384228757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51438384228696 and 51438384228705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51438384228769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36481122862 + ... + 36481124271.

It is an arithmetic number, because the mean of its divisors is an integer number (5253281793648).

Almost surely, 2^{51438384228765} is an apocalyptic number.

It is an amenable number.

51438384228765 is a deficient number, since it is larger than the sum of its proper divisors (32614124469603).

51438384228765 is a wasteful number, since it uses less digits than its factorization.

51438384228765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72962247188.

The product of its digits is 309657600, while the sum is 66.

The spelling of 51438384228765 in words is "fifty-one trillion, four hundred thirty-eight billion, three hundred eighty-four million, two hundred twenty-eight thousand, seven hundred sixty-five".