51993905851 has 2 divisors, whose sum is σ = 51993905852. Its totient is φ = 51993905850.

The previous prime is 51993905807. The next prime is 51993905879. The reversal of 51993905851 is 15850939915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51993905851 - 2⁹ = 51993905339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51993905792 and 51993905801.

It is not a weakly prime, because it can be changed into another prime (51993905881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25996952925 + 25996952926.

It is an arithmetic number, because the mean of its divisors is an integer number (25996952926).

Almost surely, 2^51993905851 is an apocalyptic number.

51993905851 is a deficient number, since it is larger than the sum of its proper divisors (1).

51993905851 is an equidigital number, since it uses as much as digits as its factorization.

51993905851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187000, while the sum is 55.

The spelling of 51993905851 in words is "fifty-one billion, nine hundred ninety-three million, nine hundred five thousand, eight hundred fifty-one".