51894440887 has 2 divisors, whose sum is σ = 51894440888. Its totient is φ = 51894440886.

The previous prime is 51894440797. The next prime is 51894440933. The reversal of 51894440887 is 78804449815.

51894440887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51894440887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51894440287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25947220443 + 25947220444.

It is an arithmetic number, because the mean of its divisors is an integer number (25947220444).

Almost surely, 2^51894440887 is an apocalyptic number.

51894440887 is a deficient number, since it is larger than the sum of its proper divisors (1).

51894440887 is an equidigital number, since it uses as much as digits as its factorization.

51894440887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 51894440887 in words is "fifty-one billion, eight hundred ninety-four million, four hundred forty thousand, eight hundred eighty-seven".