123433121523 has 4 divisors (see below), whose sum is σ = 164577495368. Its totient is φ = 82288747680.

The previous prime is 123433121521. The next prime is 123433121527. The reversal of 123433121523 is 325121334321.

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

It is not a de Polignac number, because 123433121523 - 2¹ = 123433121521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123433121521) 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, 20572186918 + ... + 20572186923.

It is an arithmetic number, because the mean of its divisors is an integer number (41144373842).

Almost surely, 2^123433121523 is an apocalyptic number.

123433121523 is a deficient number, since it is larger than the sum of its proper divisors (41144373845).

123433121523 is an equidigital number, since it uses as much as digits as its factorization.

123433121523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41144373844.

The product of its digits is 12960, while the sum is 30.

Adding to 123433121523 its reverse (325121334321), we get a palindrome (448554455844).

The spelling of 123433121523 in words is "one hundred twenty-three billion, four hundred thirty-three million, one hundred twenty-one thousand, five hundred twenty-three".