1234545656789 has 8 divisors (see below), whose sum is σ = 1246624921152. Its totient is φ = 1222468188480.

The previous prime is 1234545656777. The next prime is 1234545656831. The reversal of 1234545656789 is 9876565454321.

1234545656789 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 1234545656789 - 2¹² = 1234545652693 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1234545656089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953774 + ... + 1838144.

It is an arithmetic number, because the mean of its divisors is an integer number (155828115144).

Almost surely, 2^{1234545656789} is an apocalyptic number.

It is an amenable number.

1234545656789 is a deficient number, since it is larger than the sum of its proper divisors (12079264363).

1234545656789 is a wasteful number, since it uses less digits than its factorization.

1234545656789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898027.

The product of its digits is 217728000, while the sum is 65.

The spelling of 1234545656789 in words is "one trillion, two hundred thirty-four billion, five hundred forty-five million, six hundred fifty-six thousand, seven hundred eighty-nine".