51777199549 has 2 divisors, whose sum is σ = 51777199550. Its totient is φ = 51777199548.

The previous prime is 51777199457. The next prime is 51777199559. The reversal of 51777199549 is 94599177715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46217260324 + 5559939225 = 214982^2 + 74565^2 .

It is a cyclic number.

It is not a de Polignac number, because 51777199549 - 2¹⁷ = 51777068477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51777199559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25888599774 + 25888599775.

It is an arithmetic number, because the mean of its divisors is an integer number (25888599775).

Almost surely, 2^51777199549 is an apocalyptic number.

It is an amenable number.

51777199549 is a deficient number, since it is larger than the sum of its proper divisors (1).

51777199549 is an equidigital number, since it uses as much as digits as its factorization.

51777199549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25004700, while the sum is 64.

The spelling of 51777199549 in words is "fifty-one billion, seven hundred seventy-seven million, one hundred ninety-nine thousand, five hundred forty-nine".