51905404777 has 2 divisors, whose sum is σ = 51905404778. Its totient is φ = 51905404776.

The previous prime is 51905404763. The next prime is 51905404843. The reversal of 51905404777 is 77740450915.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42827888601 + 9077516176 = 206949^2 + 95276^2 .

It is a cyclic number.

It is not a de Polignac number, because 51905404777 - 2¹¹ = 51905402729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51905404777.

It is not a weakly prime, because it can be changed into another prime (51905414777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25952702388 + 25952702389.

It is an arithmetic number, because the mean of its divisors is an integer number (25952702389).

Almost surely, 2^51905404777 is an apocalyptic number.

It is an amenable number.

51905404777 is a deficient number, since it is larger than the sum of its proper divisors (1).

51905404777 is an equidigital number, since it uses as much as digits as its factorization.

51905404777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1234800, while the sum is 49.

The spelling of 51905404777 in words is "fifty-one billion, nine hundred five million, four hundred four thousand, seven hundred seventy-seven".