51301644043891 has 2 divisors, whose sum is σ = 51301644043892. Its totient is φ = 51301644043890.

The previous prime is 51301644043877. The next prime is 51301644044041. The reversal of 51301644043891 is 19834044610315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51301644043891 - 2⁹ = 51301644043379 is a prime.

It is not a weakly prime, because it can be changed into another prime (51301644043291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25650822021945 + 25650822021946.

It is an arithmetic number, because the mean of its divisors is an integer number (25650822021946).

Almost surely, 2^{51301644043891} is an apocalyptic number.

51301644043891 is a deficient number, since it is larger than the sum of its proper divisors (1).

51301644043891 is an equidigital number, since it uses as much as digits as its factorization.

51301644043891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 51301644043891 in words is "fifty-one trillion, three hundred one billion, six hundred forty-four million, forty-three thousand, eight hundred ninety-one".