51368275235257 has 4 divisors (see below), whose sum is σ = 51381511074036. Its totient is φ = 51355039396480.

The previous prime is 51368275235243. The next prime is 51368275235351. The reversal of 51368275235257 is 75253257286315.

It is a happy number.

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 18947425002496 + 32420850232761 = 4352864^2 + 5693931^2 .

It is a cyclic number.

It is not a de Polignac number, because 51368275235257 - 2³⁵ = 51333915496889 is a prime.

It is a super-4 number, since 4×51368275235257⁴ (a number of 56 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51368275235195 and 51368275235204.

It is not an unprimeable number, because it can be changed into a prime (51368275235357) 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, 6617913568 + ... + 6617921329.

It is an arithmetic number, because the mean of its divisors is an integer number (12845377768509).

Almost surely, 2^{51368275235257} is an apocalyptic number.

It is an amenable number.

51368275235257 is a deficient number, since it is larger than the sum of its proper divisors (13235838779).

51368275235257 is a wasteful number, since it uses less digits than its factorization.

51368275235257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13235838778.

The product of its digits is 105840000, while the sum is 61.

The spelling of 51368275235257 in words is "fifty-one trillion, three hundred sixty-eight billion, two hundred seventy-five million, two hundred thirty-five thousand, two hundred fifty-seven".