12345567778889 has 4 divisors (see below), whose sum is σ = 12385781355024. Its totient is φ = 12305354202756.

The previous prime is 12345567778877. The next prime is 12345567778897. The reversal of 12345567778889 is 98887776554321.

It is a happy number.

12345567778889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12345567778889 - 2⁸ = 12345567778633 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 (12945567778889) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20106787607 + ... + 20106788220.

It is an arithmetic number, because the mean of its divisors is an integer number (3096445338756).

Almost surely, 2^{12345567778889} is an apocalyptic number.

It is an amenable number.

12345567778889 is a deficient number, since it is larger than the sum of its proper divisors (40213576135).

12345567778889 is an equidigital number, since it uses as much as digits as its factorization.

12345567778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40213576134.

The product of its digits is 5689958400, while the sum is 80.

The spelling of 12345567778889 in words is "twelve trillion, three hundred forty-five billion, five hundred sixty-seven million, seven hundred seventy-eight thousand, eight hundred eighty-nine".