51813352585 has 8 divisors (see below), whose sum is σ = 62211746376. Its totient is φ = 41426866560.

The previous prime is 51813352571. The next prime is 51813352681. The reversal of 51813352585 is 58525331815.

It can be written as a sum of positive squares in 4 ways, for example, as 4083337801 + 47730014784 = 63901^2 + 218472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51813352585 - 2⁵ = 51813352553 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2967364 + ... + 2984773.

It is an arithmetic number, because the mean of its divisors is an integer number (7776468297).

Almost surely, 2^51813352585 is an apocalyptic number.

It is an amenable number.

51813352585 is a deficient number, since it is larger than the sum of its proper divisors (10398393791).

51813352585 is a wasteful number, since it uses less digits than its factorization.

51813352585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5953883.

The product of its digits is 720000, while the sum is 46.

The spelling of 51813352585 in words is "fifty-one billion, eight hundred thirteen million, three hundred fifty-two thousand, five hundred eighty-five".