51722175145 has 4 divisors (see below), whose sum is σ = 62066610180. Its totient is φ = 41377740112.

The previous prime is 51722175137. The next prime is 51722175151. The reversal of 51722175145 is 54157122715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54157122715 = 5 ⋅10831424543.

It can be written as a sum of positive squares in 2 ways, for example, as 24332256144 + 27389919001 = 155988^2 + 165499^2 .

It is a cyclic number.

It is not a de Polignac number, because 51722175145 - 2³ = 51722175137 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 junction number, because it is equal to n+sod(n) for n = 51722175098 and 51722175107.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5172217510 + ... + 5172217519.

It is an arithmetic number, because the mean of its divisors is an integer number (15516652545).

Almost surely, 2^51722175145 is an apocalyptic number.

It is an amenable number.

51722175145 is a deficient number, since it is larger than the sum of its proper divisors (10344435035).

51722175145 is a wasteful number, since it uses less digits than its factorization.

51722175145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10344435034.

The product of its digits is 98000, while the sum is 40.

The spelling of 51722175145 in words is "fifty-one billion, seven hundred twenty-two million, one hundred seventy-five thousand, one hundred forty-five".