54221121649 has 2 divisors, whose sum is σ = 54221121650. Its totient is φ = 54221121648.

The previous prime is 54221121641. The next prime is 54221121683. The reversal of 54221121649 is 94612112245.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43390973025 + 10830148624 = 208305^2 + 104068^2 .

It is a cyclic number.

It is not a de Polignac number, because 54221121649 - 2³ = 54221121641 is a prime.

It is not a weakly prime, because it can be changed into another prime (54221121641) 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, 27110560824 + 27110560825.

It is an arithmetic number, because the mean of its divisors is an integer number (27110560825).

Almost surely, 2^54221121649 is an apocalyptic number.

It is an amenable number.

54221121649 is a deficient number, since it is larger than the sum of its proper divisors (1).

54221121649 is an equidigital number, since it uses as much as digits as its factorization.

54221121649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The spelling of 54221121649 in words is "fifty-four billion, two hundred twenty-one million, one hundred twenty-one thousand, six hundred forty-nine".