123457778889 has 4 divisors (see below), whose sum is σ = 164610371856. Its totient is φ = 82305185924.

The previous prime is 123457778887. The next prime is 123457778897. The reversal of 123457778889 is 988877754321.

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 123457778889 - 2¹ = 123457778887 is a prime.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (123457778887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20576296479 + ... + 20576296484.

It is an arithmetic number, because the mean of its divisors is an integer number (41152592964).

Almost surely, 2^123457778889 is an apocalyptic number.

It is an amenable number.

123457778889 is a deficient number, since it is larger than the sum of its proper divisors (41152592967).

123457778889 is an equidigital number, since it uses as much as digits as its factorization.

123457778889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41152592966.

The product of its digits is 189665280, while the sum is 69.

The spelling of 123457778889 in words is "one hundred twenty-three billion, four hundred fifty-seven million, seven hundred seventy-eight thousand, eight hundred eighty-nine".