1223455567889 has 4 divisors (see below), whose sum is σ = 1276649288256. Its totient is φ = 1170261847524.

The previous prime is 1223455567861. The next prime is 1223455567927. The reversal of 1223455567889 is 9887655543221.

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 1223455567889 - 2³⁶ = 1154736091153 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 (1223455567819) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26596860149 + ... + 26596860194.

It is an arithmetic number, because the mean of its divisors is an integer number (319162322064).

Almost surely, 2^{1223455567889} is an apocalyptic number.

It is an amenable number.

1223455567889 is a deficient number, since it is larger than the sum of its proper divisors (53193720367).

1223455567889 is an equidigital number, since it uses as much as digits as its factorization.

1223455567889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53193720366.

The product of its digits is 145152000, while the sum is 65.

The spelling of 1223455567889 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-five million, five hundred sixty-seven thousand, eight hundred eighty-nine".