551709215521 has 2 divisors, whose sum is σ = 551709215522. Its totient is φ = 551709215520.

The previous prime is 551709215513. The next prime is 551709215549. The reversal of 551709215521 is 125512907155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 329090384896 + 222618830625 = 573664^2 + 471825^2 .

It is a cyclic number.

It is not a de Polignac number, because 551709215521 - 2³ = 551709215513 is a prime.

It is not a weakly prime, because it can be changed into another prime (551709212521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275854607760 + 275854607761.

It is an arithmetic number, because the mean of its divisors is an integer number (275854607761).

Almost surely, 2^551709215521 is an apocalyptic number.

It is an amenable number.

551709215521 is a deficient number, since it is larger than the sum of its proper divisors (1).

551709215521 is an equidigital number, since it uses as much as digits as its factorization.

551709215521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 43.

The spelling of 551709215521 in words is "five hundred fifty-one billion, seven hundred nine million, two hundred fifteen thousand, five hundred twenty-one".