51411685161 has 4 divisors (see below), whose sum is σ = 68548913552. Its totient is φ = 34274456772.

The previous prime is 51411685159. The next prime is 51411685163. The reversal of 51411685161 is 16158611415.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51411685159) and next prime (51411685163).

It is not a de Polignac number, because 51411685161 - 2¹ = 51411685159 is a prime.

It is a super-2 number, since 2×51411685161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51411685163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8568614191 + ... + 8568614196.

It is an arithmetic number, because the mean of its divisors is an integer number (17137228388).

Almost surely, 2^51411685161 is an apocalyptic number.

It is an amenable number.

51411685161 is a deficient number, since it is larger than the sum of its proper divisors (17137228391).

51411685161 is a wasteful number, since it uses less digits than its factorization.

51411685161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17137228390.

The product of its digits is 28800, while the sum is 39.

The spelling of 51411685161 in words is "fifty-one billion, four hundred eleven million, six hundred eighty-five thousand, one hundred sixty-one".