51466257209 has 2 divisors, whose sum is σ = 51466257210. Its totient is φ = 51466257208.

The previous prime is 51466257197. The next prime is 51466257223. The reversal of 51466257209 is 90275266415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48928112809 + 2538144400 = 221197^2 + 50380^2 .

It is a cyclic number.

It is not a de Polignac number, because 51466257209 - 2²⁴ = 51449479993 is a prime.

It is a super-2 number, since 2×51466257209² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51466257259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25733128604 + 25733128605.

It is an arithmetic number, because the mean of its divisors is an integer number (25733128605).

Almost surely, 2^51466257209 is an apocalyptic number.

It is an amenable number.

51466257209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51466257209 is an equidigital number, since it uses as much as digits as its factorization.

51466257209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 51466257209 in words is "fifty-one billion, four hundred sixty-six million, two hundred fifty-seven thousand, two hundred nine".