53721155261 has 2 divisors, whose sum is σ = 53721155262. Its totient is φ = 53721155260.

The previous prime is 53721155233. The next prime is 53721155273. The reversal of 53721155261 is 16255112735.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53300495161 + 420660100 = 230869^2 + 20510^2 .

It is a cyclic number.

It is not a de Polignac number, because 53721155261 - 2¹⁰ = 53721154237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53721155231) 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, 26860577630 + 26860577631.

It is an arithmetic number, because the mean of its divisors is an integer number (26860577631).

Almost surely, 2^53721155261 is an apocalyptic number.

It is an amenable number.

53721155261 is a deficient number, since it is larger than the sum of its proper divisors (1).

53721155261 is an equidigital number, since it uses as much as digits as its factorization.

53721155261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 38.

Adding to 53721155261 its reverse (16255112735), we get a palindrome (69976267996).

The spelling of 53721155261 in words is "fifty-three billion, seven hundred twenty-one million, one hundred fifty-five thousand, two hundred sixty-one".