51162341809 has 4 divisors (see below), whose sum is σ = 51175367460. Its totient is φ = 51149316160.

The previous prime is 51162341803. The next prime is 51162341821. The reversal of 51162341809 is 90814326115.

51162341809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 10186461184 + 40975880625 = 100928^2 + 202425^2 .

It is a cyclic number.

It is not a de Polignac number, because 51162341809 - 2³ = 51162341801 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51162341801) 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, 6506932 + ... + 6514789.

It is an arithmetic number, because the mean of its divisors is an integer number (12793841865).

Almost surely, 2^51162341809 is an apocalyptic number.

It is an amenable number.

51162341809 is a deficient number, since it is larger than the sum of its proper divisors (13025651).

51162341809 is a wasteful number, since it uses less digits than its factorization.

51162341809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13025650.

The product of its (nonzero) digits is 51840, while the sum is 40.

The spelling of 51162341809 in words is "fifty-one billion, one hundred sixty-two million, three hundred forty-one thousand, eight hundred nine".