51464401913 has 2 divisors, whose sum is σ = 51464401914. Its totient is φ = 51464401912.

The previous prime is 51464401909. The next prime is 51464401999. The reversal of 51464401913 is 31910446415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25788505744 + 25675896169 = 160588^2 + 160237^2 .

It is a cyclic number.

It is not a de Polignac number, because 51464401913 - 2² = 51464401909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51464401213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25732200956 + 25732200957.

It is an arithmetic number, because the mean of its divisors is an integer number (25732200957).

Almost surely, 2^51464401913 is an apocalyptic number.

It is an amenable number.

51464401913 is a deficient number, since it is larger than the sum of its proper divisors (1).

51464401913 is an equidigital number, since it uses as much as digits as its factorization.

51464401913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 51464401913 in words is "fifty-one billion, four hundred sixty-four million, four hundred one thousand, nine hundred thirteen".