51051516605 has 4 divisors (see below), whose sum is σ = 61261819932. Its totient is φ = 40841213280.

The previous prime is 51051516601. The next prime is 51051516617. The reversal of 51051516605 is 50661515015.

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 24866451481 + 26185065124 = 157691^2 + 161818^2 .

It is not a de Polignac number, because 51051516605 - 2² = 51051516601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051516601) 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, 5105151656 + ... + 5105151665.

It is an arithmetic number, because the mean of its divisors is an integer number (15315454983).

Almost surely, 2^51051516605 is an apocalyptic number.

It is an amenable number.

51051516605 is a deficient number, since it is larger than the sum of its proper divisors (10210303327).

51051516605 is a wasteful number, since it uses less digits than its factorization.

51051516605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10210303326.

The product of its (nonzero) digits is 22500, while the sum is 35.

The spelling of 51051516605 in words is "fifty-one billion, fifty-one million, five hundred sixteen thousand, six hundred five".