123455667789 has 6 divisors (see below), whose sum is σ = 178324853486. Its totient is φ = 82303778520.

The previous prime is 123455667779. The next prime is 123455667857. The reversal of 123455667789 is 987766554321.

123455667789 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 556 + 6 + 7 + 78 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65438756100 + 58016911689 = 255810^2 + 240867^2 .

It is not a de Polignac number, because 123455667789 - 2⁴ = 123455667773 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123455667719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6858648202 + ... + 6858648219.

Almost surely, 2^123455667789 is an apocalyptic number.

It is an amenable number.

123455667789 is a deficient number, since it is larger than the sum of its proper divisors (54869185697).

123455667789 is a wasteful number, since it uses less digits than its factorization.

123455667789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13717296427 (or 13717296424 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 63.

The spelling of 123455667789 in words is "one hundred twenty-three billion, four hundred fifty-five million, six hundred sixty-seven thousand, seven hundred eighty-nine".