123355405061 has 4 divisors (see below), whose sum is σ = 140977605792. Its totient is φ = 105733204332.

The previous prime is 123355405027. The next prime is 123355405073. The reversal of 123355405061 is 160504553321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-123355405061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123355405001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8811100355 + ... + 8811100368.

It is an arithmetic number, because the mean of its divisors is an integer number (35244401448).

Almost surely, 2^123355405061 is an apocalyptic number.

It is an amenable number.

123355405061 is a deficient number, since it is larger than the sum of its proper divisors (17622200731).

123355405061 is an equidigital number, since it uses as much as digits as its factorization.

123355405061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17622200730.

The product of its (nonzero) digits is 54000, while the sum is 35.

Adding to 123355405061 its reverse (160504553321), we get a palindrome (283859958382).

The spelling of 123355405061 in words is "one hundred twenty-three billion, three hundred fifty-five million, four hundred five thousand, sixty-one".