51439644243 has 128 divisors (see below), whose sum is σ = 88381440000. Its totient is φ = 29303793792.

The previous prime is 51439644241. The next prime is 51439644247. The reversal of 51439644243 is 34244693415.

51439644243 is a `hidden beast` number, since 5 + 14 + 396 + 4 + 4 + 243 = 666.

It is not a de Polignac number, because 51439644243 - 2¹ = 51439644241 is a prime.

It is a super-3 number, since 3×51439644243³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51439644241) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 94039296 + ... + 94039842.

It is an arithmetic number, because the mean of its divisors is an integer number (690480000).

Almost surely, 2^51439644243 is an apocalyptic number.

51439644243 is a deficient number, since it is larger than the sum of its proper divisors (36941795757).

51439644243 is a wasteful number, since it uses less digits than its factorization.

51439644243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 880 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 51439644243 in words is "fifty-one billion, four hundred thirty-nine million, six hundred forty-four thousand, two hundred forty-three".