280643844109 has 2 divisors, whose sum is σ = 280643844110. Its totient is φ = 280643844108.

The previous prime is 280643844101. The next prime is 280643844137. The reversal of 280643844109 is 901448346082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175422757225 + 105221086884 = 418835^2 + 324378^2 .

It is a cyclic number.

It is not a de Polignac number, because 280643844109 - 2³ = 280643844101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280643844101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140321922054 + 140321922055.

It is an arithmetic number, because the mean of its divisors is an integer number (140321922055).

Almost surely, 2^280643844109 is an apocalyptic number.

It is an amenable number.

280643844109 is a deficient number, since it is larger than the sum of its proper divisors (1).

280643844109 is an equidigital number, since it uses as much as digits as its factorization.

280643844109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 49.

The spelling of 280643844109 in words is "two hundred eighty billion, six hundred forty-three million, eight hundred forty-four thousand, one hundred nine".