1234455566789 has 2 divisors, whose sum is σ = 1234455566790. Its totient is φ = 1234455566788.

The previous prime is 1234455566777. The next prime is 1234455566819. The reversal of 1234455566789 is 9876655544321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 871590288100 + 362865278689 = 933590^2 + 602383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234455566789 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234455566089) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617227783394 + 617227783395.

It is an arithmetic number, because the mean of its divisors is an integer number (617227783395).

Almost surely, 2^{1234455566789} is an apocalyptic number.

It is an amenable number.

1234455566789 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234455566789 is an equidigital number, since it uses as much as digits as its factorization.

1234455566789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728000, while the sum is 65.

The spelling of 1234455566789 in words is "one trillion, two hundred thirty-four billion, four hundred fifty-five million, five hundred sixty-six thousand, seven hundred eighty-nine".