51018062581 has 2 divisors, whose sum is σ = 51018062582. Its totient is φ = 51018062580.

The previous prime is 51018062497. The next prime is 51018062593. The reversal of 51018062581 is 18526081015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44548434225 + 6469628356 = 211065^2 + 80434^2 .

It is a cyclic number.

It is not a de Polignac number, because 51018062581 - 2⁷ = 51018062453 is a prime.

It is a super-2 number, since 2×51018062581² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51018062581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51018062681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25509031290 + 25509031291.

It is an arithmetic number, because the mean of its divisors is an integer number (25509031291).

Almost surely, 2^51018062581 is an apocalyptic number.

It is an amenable number.

51018062581 is a deficient number, since it is larger than the sum of its proper divisors (1).

51018062581 is an equidigital number, since it uses as much as digits as its factorization.

51018062581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 37.

The spelling of 51018062581 in words is "fifty-one billion, eighteen million, sixty-two thousand, five hundred eighty-one".