123115212555 has 16 divisors (see below), whose sum is σ = 199197649440. Its totient is φ = 64923676928.

The previous prime is 123115212547. The next prime is 123115212617. The reversal of 123115212555 is 555212511321.

It is a cyclic number.

It is not a de Polignac number, because 123115212555 - 2³ = 123115212547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46109232 + ... + 46111901.

It is an arithmetic number, because the mean of its divisors is an integer number (12449853090).

Almost surely, 2^123115212555 is an apocalyptic number.

123115212555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123115212555 is a deficient number, since it is larger than the sum of its proper divisors (76082436885).

123115212555 is an equidigital number, since it uses as much as digits as its factorization.

123115212555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92221230.

The product of its digits is 15000, while the sum is 33.

Adding to 123115212555 its reverse (555212511321), we get a palindrome (678327723876).

The spelling of 123115212555 in words is "one hundred twenty-three billion, one hundred fifteen million, two hundred twelve thousand, five hundred fifty-five".