6428618549 has 2 divisors, whose sum is σ = 6428618550. Its totient is φ = 6428618548.

The previous prime is 6428618531. The next prime is 6428618563. The reversal of 6428618549 is 9458168246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5536401649 + 892216900 = 74407^2 + 29870^2 .

It is a cyclic number.

It is not a de Polignac number, because 6428618549 - 2¹⁶ = 6428553013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6428618549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6428618509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214309274 + 3214309275.

It is an arithmetic number, because the mean of its divisors is an integer number (3214309275).

Almost surely, 2^6428618549 is an apocalyptic number.

It is an amenable number.

6428618549 is a deficient number, since it is larger than the sum of its proper divisors (1).

6428618549 is an equidigital number, since it uses as much as digits as its factorization.

6428618549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 53.

The square root of 6428618549 is about 80178.6664206882. Note that the first 3 decimals coincide. The cubic root of 6428618549 is about 1859.3988257358.

The spelling of 6428618549 in words is "six billion, four hundred twenty-eight million, six hundred eighteen thousand, five hundred forty-nine".