51166053409 has 2 divisors, whose sum is σ = 51166053410. Its totient is φ = 51166053408.

The previous prime is 51166053329. The next prime is 51166053457. The reversal of 51166053409 is 90435066115.

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., 39351450384 + 11814603025 = 198372^2 + 108695^2 .

It is a cyclic number.

It is not a de Polignac number, because 51166053409 - 2⁹ = 51166052897 is a prime.

It is not a weakly prime, because it can be changed into another prime (51166053469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25583026704 + 25583026705.

It is an arithmetic number, because the mean of its divisors is an integer number (25583026705).

Almost surely, 2^51166053409 is an apocalyptic number.

It is an amenable number.

51166053409 is a deficient number, since it is larger than the sum of its proper divisors (1).

51166053409 is an equidigital number, since it uses as much as digits as its factorization.

51166053409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 51166053409 in words is "fifty-one billion, one hundred sixty-six million, fifty-three thousand, four hundred nine".