51616565005 has 4 divisors (see below), whose sum is σ = 61939878012. Its totient is φ = 41293252000.

The previous prime is 51616564843. The next prime is 51616565041. The reversal of 51616565005 is 50056561615.

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 14328568804 + 37287996201 = 119702^2 + 193101^2 .

It is not a de Polignac number, because 51616565005 - 2¹³ = 51616556813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5161656496 + ... + 5161656505.

It is an arithmetic number, because the mean of its divisors is an integer number (15484969503).

Almost surely, 2^51616565005 is an apocalyptic number.

It is an amenable number.

51616565005 is a deficient number, since it is larger than the sum of its proper divisors (10323313007).

51616565005 is a wasteful number, since it uses less digits than its factorization.

51616565005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10323313006.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51616565005 in words is "fifty-one billion, six hundred sixteen million, five hundred sixty-five thousand, five".