123255335545520 has 20 divisors (see below), whose sum is σ = 286568655143520. Its totient is φ = 49302134218176.

The previous prime is 123255335545513. The next prime is 123255335545543. The reversal of 123255335545520 is 25545533552321.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770345847080 + ... + 770345847239.

It is an arithmetic number, because the mean of its divisors is an integer number (14328432757176).

Almost surely, 2^{123255335545520} is an apocalyptic number.

123255335545520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123255335545520 is an abundant number, since it is smaller than the sum of its proper divisors (163313319598000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123255335545520 is a wasteful number, since it uses less digits than its factorization.

123255335545520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1540691694332 (or 1540691694326 counting only the distinct ones).

The product of its (nonzero) digits is 13500000, while the sum is 50.

The spelling of 123255335545520 in words is "one hundred twenty-three trillion, two hundred fifty-five billion, three hundred thirty-five million, five hundred forty-five thousand, five hundred twenty".