13123520520 has 128 divisors (see below), whose sum is σ = 43103767680. Its totient is φ = 3170048000.

The previous prime is 13123520497. The next prime is 13123520537. The reversal of 13123520520 is 2502532131.

It is a happy number.

It is a super-2 number, since 2×13123520520² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 353230 + ... + 388610.

It is an arithmetic number, because the mean of its divisors is an integer number (336748185).

Almost surely, 2^13123520520 is an apocalyptic number.

13123520520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13123520520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21551883840).

13123520520 is an abundant number, since it is smaller than the sum of its proper divisors (29980247160).

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

13123520520 is a wasteful number, since it uses less digits than its factorization.

13123520520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35687 (or 35683 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 13123520520 in words is "thirteen billion, one hundred twenty-three million, five hundred twenty thousand, five hundred twenty".