122445557789 has 4 divisors (see below), whose sum is σ = 122477046780. Its totient is φ = 122414068800.

The previous prime is 122445557771. The next prime is 122445557803. The reversal of 122445557789 is 987755544221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73457260900 + 48988296889 = 271030^2 + 221333^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122445557789 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 (122445557089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15738662 + ... + 15746439.

It is an arithmetic number, because the mean of its divisors is an integer number (30619261695).

Almost surely, 2^122445557789 is an apocalyptic number.

It is an amenable number.

122445557789 is a deficient number, since it is larger than the sum of its proper divisors (31488991).

122445557789 is an equidigital number, since it uses as much as digits as its factorization.

122445557789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31488990.

The product of its digits is 28224000, while the sum is 59.

The spelling of 122445557789 in words is "one hundred twenty-two billion, four hundred forty-five million, five hundred fifty-seven thousand, seven hundred eighty-nine".