123243534055511 has 4 divisors (see below), whose sum is σ = 123320225739792. Its totient is φ = 123166842371232.

The previous prime is 123243534055483. The next prime is 123243534055541. The reversal of 123243534055511 is 115550435342321.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123243534055511 is a prime.

It is a super-2 number, since 2×123243534055511² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243534055541) 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, 38345839730 + ... + 38345842943.

It is an arithmetic number, because the mean of its divisors is an integer number (30830056434948).

Almost surely, 2^{123243534055511} is an apocalyptic number.

123243534055511 is a deficient number, since it is larger than the sum of its proper divisors (76691684281).

123243534055511 is an equidigital number, since it uses as much as digits as its factorization.

123243534055511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76691684280.

The product of its (nonzero) digits is 1080000, while the sum is 44.

Adding to 123243534055511 its reverse (115550435342321), we get a palindrome (238793969397832).

The spelling of 123243534055511 in words is "one hundred twenty-three trillion, two hundred forty-three billion, five hundred thirty-four million, fifty-five thousand, five hundred eleven".