51661773223 has 2 divisors, whose sum is σ = 51661773224. Its totient is φ = 51661773222.

The previous prime is 51661773199. The next prime is 51661773269. The reversal of 51661773223 is 32237716615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51661773223 - 2³³ = 43071838631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51661773223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51661773283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830886611 + 25830886612.

It is an arithmetic number, because the mean of its divisors is an integer number (25830886612).

Almost surely, 2^51661773223 is an apocalyptic number.

51661773223 is a deficient number, since it is larger than the sum of its proper divisors (1).

51661773223 is an equidigital number, since it uses as much as digits as its factorization.

51661773223 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The spelling of 51661773223 in words is "fifty-one billion, six hundred sixty-one million, seven hundred seventy-three thousand, two hundred twenty-three".