51349705418861 has 2 divisors, whose sum is σ = 51349705418862. Its totient is φ = 51349705418860.

The previous prime is 51349705418833. The next prime is 51349705418899. The reversal of 51349705418861 is 16881450794315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47058982602025 + 4290722816836 = 6859955^2 + 2071406^2 .

It is a cyclic number.

It is not a de Polignac number, because 51349705418861 - 2⁶ = 51349705418797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51349705418794 and 51349705418803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51349705418801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25674852709430 + 25674852709431.

It is an arithmetic number, because the mean of its divisors is an integer number (25674852709431).

Almost surely, 2^{51349705418861} is an apocalyptic number.

It is an amenable number.

51349705418861 is a deficient number, since it is larger than the sum of its proper divisors (1).

51349705418861 is an equidigital number, since it uses as much as digits as its factorization.

51349705418861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29030400, while the sum is 62.

The spelling of 51349705418861 in words is "fifty-one trillion, three hundred forty-nine billion, seven hundred five million, four hundred eighteen thousand, eight hundred sixty-one".