123015355204240 has 20 divisors (see below), whose sum is σ = 286010700850044. Its totient is φ = 49206142081664.

The previous prime is 123015355204229. The next prime is 123015355204241. The reversal of 123015355204240 is 42402553510321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 80606710559376 + 42408644644864 = 8978124^2 + 6512192^2 .

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

It is a super-2 number, since 2×123015355204240² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123015355204240.

It is not an unprimeable number, because it can be changed into a prime (123015355204241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768845969947 + ... + 768845970106.

Almost surely, 2^{123015355204240} is an apocalyptic number.

123015355204240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123015355204240 is an abundant number, since it is smaller than the sum of its proper divisors (162995345645804).

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

123015355204240 is a wasteful number, since it uses less digits than its factorization.

123015355204240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537691940066 (or 1537691940060 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 123015355204240 in words is "one hundred twenty-three trillion, fifteen billion, three hundred fifty-five million, two hundred four thousand, two hundred forty".