13123454012540 has 24 divisors (see below), whose sum is σ = 27562845466800. Its totient is φ = 5248697406848.

The previous prime is 13123454012533. The next prime is 13123454012561. The reversal of 13123454012540 is 4521045432131.

It is a self number, because there is not a number n which added to its sum of digits gives 13123454012540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42605090 + ... + 42912009.

It is an arithmetic number, because the mean of its divisors is an integer number (1148451894450).

Almost surely, 2^{13123454012540} is an apocalyptic number.

13123454012540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13123454012540 is an abundant number, since it is smaller than the sum of its proper divisors (14439391454260).

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

13123454012540 is a wasteful number, since it uses less digits than its factorization.

13123454012540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85524781 (or 85524779 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 13123454012540 its reverse (4521045432131), we get a palindrome (17644499444671).

The spelling of 13123454012540 in words is "thirteen trillion, one hundred twenty-three billion, four hundred fifty-four million, twelve thousand, five hundred forty".