621546220489 has 2 divisors, whose sum is σ = 621546220490. Its totient is φ = 621546220488.

The previous prime is 621546220469. The next prime is 621546220499. The reversal of 621546220489 is 984022645126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 581851635264 + 39694585225 = 762792^2 + 199235^2 .

It is a cyclic number.

It is not a de Polignac number, because 621546220489 - 2²³ = 621537831881 is a prime.

It is not a weakly prime, because it can be changed into another prime (621546220459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310773110244 + 310773110245.

It is an arithmetic number, because the mean of its divisors is an integer number (310773110245).

Almost surely, 2^621546220489 is an apocalyptic number.

It is an amenable number.

621546220489 is a deficient number, since it is larger than the sum of its proper divisors (1).

621546220489 is an equidigital number, since it uses as much as digits as its factorization.

621546220489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 621546220489 in words is "six hundred twenty-one billion, five hundred forty-six million, two hundred twenty thousand, four hundred eighty-nine".