1123456777889 has 8 divisors (see below), whose sum is σ = 1189563054048. Its totient is φ = 1057352788800.

The previous prime is 1123456777837. The next prime is 1123456777951. The reversal of 1123456777889 is 9887776543211.

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 1123456777889 - 2²⁰ = 1123455729313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1123456777819) 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, 496634 + ... + 1579100.

It is an arithmetic number, because the mean of its divisors is an integer number (148695381756).

Almost surely, 2^{1123456777889} is an apocalyptic number.

It is an amenable number.

1123456777889 is a deficient number, since it is larger than the sum of its proper divisors (66106276159).

1123456777889 is a wasteful number, since it uses less digits than its factorization.

1123456777889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143535.

The product of its digits is 142248960, while the sum is 68.

The spelling of 1123456777889 in words is "one trillion, one hundred twenty-three billion, four hundred fifty-six million, seven hundred seventy-seven thousand, eight hundred eighty-nine".