13400405520520 has 32 divisors (see below), whose sum is σ = 31737802550400. Its totient is φ = 5078048407488.

The previous prime is 13400405520493. The next prime is 13400405520521. The reversal of 13400405520520 is 2502550400431.

It is a super-2 number, since 2×13400405520520² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13400405520521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8816055504 + ... + 8816057023.

It is an arithmetic number, because the mean of its divisors is an integer number (991806329700).

Almost surely, 2^{13400405520520} is an apocalyptic number.

13400405520520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13400405520520 is an abundant number, since it is smaller than the sum of its proper divisors (18337397029880).

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

13400405520520 is a wasteful number, since it uses less digits than its factorization.

13400405520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17632112557 (or 17632112553 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 13400405520520 its reverse (2502550400431), we get a palindrome (15902955920951).

The spelling of 13400405520520 in words is "thirteen trillion, four hundred billion, four hundred five million, five hundred twenty thousand, five hundred twenty".