621560608849 has 2 divisors, whose sum is σ = 621560608850. Its totient is φ = 621560608848.

The previous prime is 621560608829. The next prime is 621560608901. The reversal of 621560608849 is 948806065126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494687155600 + 126873453249 = 703340^2 + 356193^2 .

It is a cyclic number.

It is not a de Polignac number, because 621560608849 - 2⁹ = 621560608337 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 621560608849.

It is not a weakly prime, because it can be changed into another prime (621560608829) 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, 310780304424 + 310780304425.

It is an arithmetic number, because the mean of its divisors is an integer number (310780304425).

Almost surely, 2^621560608849 is an apocalyptic number.

It is an amenable number.

621560608849 is a deficient number, since it is larger than the sum of its proper divisors (1).

621560608849 is an equidigital number, since it uses as much as digits as its factorization.

621560608849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4976640, while the sum is 55.

The spelling of 621560608849 in words is "six hundred twenty-one billion, five hundred sixty million, six hundred eight thousand, eight hundred forty-nine".