551721373771 has 2 divisors, whose sum is σ = 551721373772. Its totient is φ = 551721373770.

The previous prime is 551721373727. The next prime is 551721373787. The reversal of 551721373771 is 177373127155.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-551721373771 is a prime.

It is not a weakly prime, because it can be changed into another prime (551721370771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275860686885 + 275860686886.

It is an arithmetic number, because the mean of its divisors is an integer number (275860686886).

Almost surely, 2^551721373771 is an apocalyptic number.

551721373771 is a deficient number, since it is larger than the sum of its proper divisors (1).

551721373771 is an equidigital number, since it uses as much as digits as its factorization.

551721373771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080450, while the sum is 49.

The spelling of 551721373771 in words is "five hundred fifty-one billion, seven hundred twenty-one million, three hundred seventy-three thousand, seven hundred seventy-one".