654557849549 has 2 divisors, whose sum is σ = 654557849550. Its totient is φ = 654557849548.

The previous prime is 654557849507. The next prime is 654557849557. The reversal of 654557849549 is 945948755456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 528892562500 + 125665287049 = 727250^2 + 354493^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-654557849549 is a prime.

It is a super-2 number, since 2×654557849549² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (654557843549) 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, 327278924774 + 327278924775.

It is an arithmetic number, because the mean of its divisors is an integer number (327278924775).

Almost surely, 2^654557849549 is an apocalyptic number.

It is an amenable number.

654557849549 is a deficient number, since it is larger than the sum of its proper divisors (1).

654557849549 is an equidigital number, since it uses as much as digits as its factorization.

654557849549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640000, while the sum is 71.

The spelling of 654557849549 in words is "six hundred fifty-four billion, five hundred fifty-seven million, eight hundred forty-nine thousand, five hundred forty-nine".