123220555115 has 64 divisors (see below), whose sum is σ = 176155499520. Its totient is φ = 80989009920.

The previous prime is 123220555109. The next prime is 123220555151. The reversal of 123220555115 is 511555022321.

It is not a de Polignac number, because 123220555115 - 2¹⁸ = 123220292971 is a prime.

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, 83200175 + ... + 83201655.

It is an arithmetic number, because the mean of its divisors is an integer number (2752429680).

Almost surely, 2^123220555115 is an apocalyptic number.

123220555115 is a deficient number, since it is larger than the sum of its proper divisors (52934944405).

123220555115 is a wasteful number, since it uses less digits than its factorization.

123220555115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532.

The product of its (nonzero) digits is 15000, while the sum is 32.

Adding to 123220555115 its reverse (511555022321), we get a palindrome (634775577436).

The spelling of 123220555115 in words is "one hundred twenty-three billion, two hundred twenty million, five hundred fifty-five thousand, one hundred fifteen".