51895505161 has 4 divisors (see below), whose sum is σ = 51957360000. Its totient is φ = 51833650324.

The previous prime is 51895505149. The next prime is 51895505171. The reversal of 51895505161 is 16150559815.

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 a cyclic number.

It is not a de Polignac number, because 51895505161 - 2¹¹ = 51895503113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51895505171) 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, 30926161 + ... + 30927838.

It is an arithmetic number, because the mean of its divisors is an integer number (12989340000).

Almost surely, 2^51895505161 is an apocalyptic number.

It is an amenable number.

51895505161 is a deficient number, since it is larger than the sum of its proper divisors (61854839).

51895505161 is an equidigital number, since it uses as much as digits as its factorization.

51895505161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61854838.

The product of its (nonzero) digits is 270000, while the sum is 46.

The spelling of 51895505161 in words is "fifty-one billion, eight hundred ninety-five million, five hundred five thousand, one hundred sixty-one".