51844047078517 has 4 divisors (see below), whose sum is σ = 52357354475436. Its totient is φ = 51330739681600.

The previous prime is 51844047078491. The next prime is 51844047078521. The reversal of 51844047078517 is 71587074044815.

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

It can be written as a sum of positive squares in 2 ways, for example, as 41126581826001 + 10717465252516 = 6413001^2 + 3273754^2 .

It is a cyclic number.

It is not a de Polignac number, because 51844047078517 - 2²³ = 51844038689909 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 (51844047078017) 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, 256653698308 + ... + 256653698509.

It is an arithmetic number, because the mean of its divisors is an integer number (13089338618859).

Almost surely, 2^{51844047078517} is an apocalyptic number.

It is an amenable number.

51844047078517 is a deficient number, since it is larger than the sum of its proper divisors (513307396919).

51844047078517 is a wasteful number, since it uses less digits than its factorization.

51844047078517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513307396918.

The product of its (nonzero) digits is 35123200, while the sum is 61.

The spelling of 51844047078517 in words is "fifty-one trillion, eight hundred forty-four billion, forty-seven million, seventy-eight thousand, five hundred seventeen".