123401543553505 has 32 divisors (see below), whose sum is σ = 170369582611968. Its totient is φ = 84051692928000.

The previous prime is 123401543553503. The next prime is 123401543553511. The reversal of 123401543553505 is 505355345104321.

It is a happy number.

It is not a de Polignac number, because 123401543553505 - 2¹ = 123401543553503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123401543553503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72306199 + ... + 73993171.

It is an arithmetic number, because the mean of its divisors is an integer number (5324049456624).

Almost surely, 2^{123401543553505} is an apocalyptic number.

It is an amenable number.

123401543553505 is a deficient number, since it is larger than the sum of its proper divisors (46968039058463).

123401543553505 is a wasteful number, since it uses less digits than its factorization.

123401543553505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700977.

The product of its (nonzero) digits is 2700000, while the sum is 46.

Adding to 123401543553505 its reverse (505355345104321), we get a palindrome (628756888657826).

The spelling of 123401543553505 in words is "one hundred twenty-three trillion, four hundred one billion, five hundred forty-three million, five hundred fifty-three thousand, five hundred five".