551055611021 has 2 divisors, whose sum is σ = 551055611022. Its totient is φ = 551055611020.

The previous prime is 551055611011. The next prime is 551055611087. The reversal of 551055611021 is 120116550155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541197106921 + 9858504100 = 735661^2 + 99290^2 .

It is a cyclic number.

It is not a de Polignac number, because 551055611021 - 2³⁰ = 549981869197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (551055611011) 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, 275527805510 + 275527805511.

It is an arithmetic number, because the mean of its divisors is an integer number (275527805511).

Almost surely, 2^551055611021 is an apocalyptic number.

It is an amenable number.

551055611021 is a deficient number, since it is larger than the sum of its proper divisors (1).

551055611021 is an equidigital number, since it uses as much as digits as its factorization.

551055611021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7500, while the sum is 32.

The spelling of 551055611021 in words is "five hundred fifty-one billion, fifty-five million, six hundred eleven thousand, twenty-one".