51610163281 has 2 divisors, whose sum is σ = 51610163282. Its totient is φ = 51610163280.

The previous prime is 51610163221. The next prime is 51610163291. The reversal of 51610163281 is 18236101615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50382291600 + 1227871681 = 224460^2 + 35041^2 .

It is a cyclic number.

It is not a de Polignac number, because 51610163281 - 2⁷ = 51610163153 is a prime.

It is a super-2 number, since 2×51610163281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51610163221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25805081640 + 25805081641.

It is an arithmetic number, because the mean of its divisors is an integer number (25805081641).

Almost surely, 2^51610163281 is an apocalyptic number.

It is an amenable number.

51610163281 is a deficient number, since it is larger than the sum of its proper divisors (1).

51610163281 is an equidigital number, since it uses as much as digits as its factorization.

51610163281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 34.

Adding to 51610163281 its reverse (18236101615), we get a palindrome (69846264896).

The spelling of 51610163281 in words is "fifty-one billion, six hundred ten million, one hundred sixty-three thousand, two hundred eighty-one".