551215534721 has 2 divisors, whose sum is σ = 551215534722. Its totient is φ = 551215534720.

The previous prime is 551215534703. The next prime is 551215534733. The reversal of 551215534721 is 127435512155.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 531894534721 + 19321000000 = 729311^2 + 139000^2 .

It is a cyclic number.

It is not a de Polignac number, because 551215534721 - 2³⁰ = 550141792897 is a prime.

It is not a weakly prime, because it can be changed into another prime (551215524721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275607767360 + 275607767361.

It is an arithmetic number, because the mean of its divisors is an integer number (275607767361).

Almost surely, 2^551215534721 is an apocalyptic number.

It is an amenable number.

551215534721 is a deficient number, since it is larger than the sum of its proper divisors (1).

551215534721 is an equidigital number, since it uses as much as digits as its factorization.

551215534721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210000, while the sum is 41.

The spelling of 551215534721 in words is "five hundred fifty-one billion, two hundred fifteen million, five hundred thirty-four thousand, seven hundred twenty-one".