123012320020505 has 16 divisors (see below), whose sum is σ = 151998642818064. Its totient is φ = 95512156446720.

The previous prime is 123012320020453. The next prime is 123012320020537. The reversal of 123012320020505 is 505020023210321.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 41206282700944 + 81806037319561 = 6419212^2 + 9044669^2 .

It is not a de Polignac number, because 123012320020505 - 2¹⁰ = 123012320019481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1554520274 + ... + 1554599403.

It is an arithmetic number, because the mean of its divisors is an integer number (9499915176129).

Almost surely, 2^{123012320020505} is an apocalyptic number.

It is an amenable number.

123012320020505 is a deficient number, since it is larger than the sum of its proper divisors (28986322797559).

123012320020505 is a wasteful number, since it uses less digits than its factorization.

123012320020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3109119916.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 123012320020505 its reverse (505020023210321), we get a palindrome (628032343230826).

The spelling of 123012320020505 in words is "one hundred twenty-three trillion, twelve billion, three hundred twenty million, twenty thousand, five hundred five".