123122455505 has 64 divisors (see below), whose sum is σ = 173299875840. Its totient is φ = 82238367744.

The previous prime is 123122455493. The next prime is 123122455529. The reversal of 123122455505 is 505554221321.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 123122455505 - 2²⁰ = 123121406929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125251244 + ... + 125252226.

It is an arithmetic number, because the mean of its divisors is an integer number (2707810560).

Almost surely, 2^123122455505 is an apocalyptic number.

It is an amenable number.

123122455505 is a deficient number, since it is larger than the sum of its proper divisors (50177420335).

123122455505 is an equidigital number, since it uses as much as digits as its factorization.

123122455505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 123122455505 its reverse (505554221321), we get a palindrome (628676676826).

The spelling of 123122455505 in words is "one hundred twenty-three billion, one hundred twenty-two million, four hundred fifty-five thousand, five hundred five".