51510204253 has 4 divisors (see below), whose sum is σ = 51590564028. Its totient is φ = 51429844480.

The previous prime is 51510204233. The next prime is 51510204259. The reversal of 51510204253 is 35240201515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35240201515 = 5 ⋅7048040303.

It can be written as a sum of positive squares in 2 ways, for example, as 19298210724 + 32211993529 = 138918^2 + 179477^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51510204253 is a prime.

It is a super-2 number, since 2×51510204253² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51510204259) 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, 40178926 + ... + 40180207.

It is an arithmetic number, because the mean of its divisors is an integer number (12897641007).

Almost surely, 2^51510204253 is an apocalyptic number.

It is an amenable number.

51510204253 is a deficient number, since it is larger than the sum of its proper divisors (80359775).

51510204253 is an equidigital number, since it uses as much as digits as its factorization.

51510204253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80359774.

The product of its (nonzero) digits is 6000, while the sum is 28.

Adding to 51510204253 its reverse (35240201515), we get a palindrome (86750405768).

The spelling of 51510204253 in words is "fifty-one billion, five hundred ten million, two hundred four thousand, two hundred fifty-three".