155111505422123 has 4 divisors (see below), whose sum is σ = 155610256243728. Its totient is φ = 154612754600520.

The previous prime is 155111505422077. The next prime is 155111505422147. The reversal of 155111505422123 is 321224505111551.

155111505422123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155111505422123 - 2⁶ = 155111505422059 is a prime.

It is a super-2 number, since 2×155111505422123² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155111505482123) 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, 249375410336 + ... + 249375410957.

It is an arithmetic number, because the mean of its divisors is an integer number (38902564060932).

Almost surely, 2^{155111505422123} is an apocalyptic number.

155111505422123 is a deficient number, since it is larger than the sum of its proper divisors (498750821605).

155111505422123 is an equidigital number, since it uses as much as digits as its factorization.

155111505422123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498750821604.

The product of its (nonzero) digits is 60000, while the sum is 38.

The spelling of 155111505422123 in words is "one hundred fifty-five trillion, one hundred eleven billion, five hundred five million, four hundred twenty-two thousand, one hundred twenty-three".