51990266771 has 2 divisors, whose sum is σ = 51990266772. Its totient is φ = 51990266770.

The previous prime is 51990266747. The next prime is 51990266791. The reversal of 51990266771 is 17766209915.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51990266771 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51990266791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25995133385 + 25995133386.

It is an arithmetic number, because the mean of its divisors is an integer number (25995133386).

Almost surely, 2^51990266771 is an apocalyptic number.

51990266771 is a deficient number, since it is larger than the sum of its proper divisors (1).

51990266771 is an equidigital number, since it uses as much as digits as its factorization.

51990266771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 51990266771 in words is "fifty-one billion, nine hundred ninety million, two hundred sixty-six thousand, seven hundred seventy-one".