1234556778889 has 8 divisors (see below), whose sum is σ = 1411599400640. Its totient is φ = 1057683499056.

The previous prime is 1234556778883. The next prime is 1234556778901. The reversal of 1234556778889 is 9888776554321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1234556778889 - 2¹³ = 1234556770697 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1234556778883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42319854 + ... + 42349015.

It is an arithmetic number, because the mean of its divisors is an integer number (176449925080).

Almost surely, 2^{1234556778889} is an apocalyptic number.

It is an amenable number.

1234556778889 is a deficient number, since it is larger than the sum of its proper divisors (177042621751).

1234556778889 is an equidigital number, since it uses as much as digits as its factorization.

1234556778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84670959.

The product of its digits is 812851200, while the sum is 73.

The spelling of 1234556778889 in words is "one trillion, two hundred thirty-four billion, five hundred fifty-six million, seven hundred seventy-eight thousand, eight hundred eighty-nine".