51123531605 has 64 divisors (see below), whose sum is σ = 68615672832. Its totient is φ = 36399144960.

The previous prime is 51123531587. The next prime is 51123531607. The reversal of 51123531605 is 50613532115.

It is not a de Polignac number, because 51123531605 - 2¹⁰ = 51123530581 is a prime.

It is a super-2 number, since 2×51123531605² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51123531607) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17524607 + ... + 17527523.

It is an arithmetic number, because the mean of its divisors is an integer number (1072119888).

Almost surely, 2^51123531605 is an apocalyptic number.

It is an amenable number.

51123531605 is a deficient number, since it is larger than the sum of its proper divisors (17492141227).

51123531605 is a wasteful number, since it uses less digits than its factorization.

51123531605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134.

The product of its (nonzero) digits is 13500, while the sum is 32.

The spelling of 51123531605 in words is "fifty-one billion, one hundred twenty-three million, five hundred thirty-one thousand, six hundred five".