123542531355511 has 4 divisors (see below), whose sum is σ = 123542583250072. Its totient is φ = 123542479460952.

The previous prime is 123542531355469. The next prime is 123542531355533. The reversal of 123542531355511 is 115553135245321.

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

It is a cyclic number.

It is not a de Polignac number, because 123542531355511 - 2⁹ = 123542531354999 is a prime.

It is a super-2 number, since 2×123542531355511² (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 (123542531355211) 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, 22195485 + ... + 27197878.

It is an arithmetic number, because the mean of its divisors is an integer number (30885645812518).

Almost surely, 2^{123542531355511} is an apocalyptic number.

123542531355511 is a deficient number, since it is larger than the sum of its proper divisors (51894561).

123542531355511 is an equidigital number, since it uses as much as digits as its factorization.

123542531355511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51894560.

The product of its digits is 1350000, while the sum is 46.

The spelling of 123542531355511 in words is "one hundred twenty-three trillion, five hundred forty-two billion, five hundred thirty-one million, three hundred fifty-five thousand, five hundred eleven".