51000606511681 has 2 divisors, whose sum is σ = 51000606511682. Its totient is φ = 51000606511680.

The previous prime is 51000606511609. The next prime is 51000606511697. The reversal of 51000606511681 is 18611560600015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44590007880625 + 6410598631056 = 6677575^2 + 2531916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51000606511681 is a prime.

It is a super-2 number, since 2×51000606511681² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51000606514681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25500303255840 + 25500303255841.

It is an arithmetic number, because the mean of its divisors is an integer number (25500303255841).

Almost surely, 2^{51000606511681} is an apocalyptic number.

It is an amenable number.

51000606511681 is a deficient number, since it is larger than the sum of its proper divisors (1).

51000606511681 is an equidigital number, since it uses as much as digits as its factorization.

51000606511681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 40.

The spelling of 51000606511681 in words is "fifty-one trillion, six hundred six million, five hundred eleven thousand, six hundred eighty-one".