51777199457 has 2 divisors, whose sum is σ = 51777199458. Its totient is φ = 51777199456.

The previous prime is 51777199393. The next prime is 51777199549. The reversal of 51777199457 is 75499177715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29708314321 + 22068885136 = 172361^2 + 148556^2 .

It is a cyclic number.

It is not a de Polignac number, because 51777199457 - 2⁶ = 51777199393 is a prime.

It is a super-2 number, since 2×51777199457² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51777199457.

It is not a weakly prime, because it can be changed into another prime (51767199457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25888599728 + 25888599729.

It is an arithmetic number, because the mean of its divisors is an integer number (25888599729).

Almost surely, 2^51777199457 is an apocalyptic number.

It is an amenable number.

51777199457 is a deficient number, since it is larger than the sum of its proper divisors (1).

51777199457 is an equidigital number, since it uses as much as digits as its factorization.

51777199457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19448100, while the sum is 62.

The spelling of 51777199457 in words is "fifty-one billion, seven hundred seventy-seven million, one hundred ninety-nine thousand, four hundred fifty-seven".