51488495449 has 2 divisors, whose sum is σ = 51488495450. Its totient is φ = 51488495448.

The previous prime is 51488495419. The next prime is 51488495521. The reversal of 51488495449 is 94459488415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30753935424 + 20734560025 = 175368^2 + 143995^2 .

It is a cyclic number.

It is not a de Polignac number, because 51488495449 - 2¹⁷ = 51488364377 is a prime.

It is a super-3 number, since 3×51488495449³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (51488495419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25744247724 + 25744247725.

It is an arithmetic number, because the mean of its divisors is an integer number (25744247725).

Almost surely, 2^51488495449 is an apocalyptic number.

It is an amenable number.

51488495449 is a deficient number, since it is larger than the sum of its proper divisors (1).

51488495449 is an equidigital number, since it uses as much as digits as its factorization.

51488495449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33177600, while the sum is 61.

The spelling of 51488495449 in words is "fifty-one billion, four hundred eighty-eight million, four hundred ninety-five thousand, four hundred forty-nine".