51406430320549 has 2 divisors, whose sum is σ = 51406430320550. Its totient is φ = 51406430320548.

The previous prime is 51406430320471. The next prime is 51406430320621. The reversal of 51406430320549 is 94502303460415.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46761758798049 + 4644671522500 = 6838257^2 + 2155150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51406430320549 is a prime.

It is a super-2 number, since 2×51406430320549² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51406430320499 and 51406430320508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51406410320549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25703215160274 + 25703215160275.

It is an arithmetic number, because the mean of its divisors is an integer number (25703215160275).

Almost surely, 2^{51406430320549} is an apocalyptic number.

It is an amenable number.

51406430320549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51406430320549 is an equidigital number, since it uses as much as digits as its factorization.

51406430320549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 46.

The spelling of 51406430320549 in words is "fifty-one trillion, four hundred six billion, four hundred thirty million, three hundred twenty thousand, five hundred forty-nine".