553115515450021 has 2 divisors, whose sum is σ = 553115515450022. Its totient is φ = 553115515450020.

The previous prime is 553115515449971. The next prime is 553115515450081. The reversal of 553115515450021 is 120054515511355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373827298528996 + 179288216921025 = 19334614^2 + 13389855^2 .

It is a cyclic number.

It is not a de Polignac number, because 553115515450021 - 2¹⁹ = 553115514925733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 553115515450021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553115515450081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276557757725010 + 276557757725011.

It is an arithmetic number, because the mean of its divisors is an integer number (276557757725011).

Almost surely, 2^{553115515450021} is an apocalyptic number.

It is an amenable number.

553115515450021 is a deficient number, since it is larger than the sum of its proper divisors (1).

553115515450021 is an equidigital number, since it uses as much as digits as its factorization.

553115515450021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 375000, while the sum is 43.

The spelling of 553115515450021 in words is "five hundred fifty-three trillion, one hundred fifteen billion, five hundred fifteen million, four hundred fifty thousand, twenty-one".