13513555405 has 12 divisors (see below), whose sum is σ = 18863820540. Its totient is φ = 9266437824.

The previous prime is 13513555373. The next prime is 13513555423. The reversal of 13513555405 is 50455531531.

It can be written as a sum of positive squares in 2 ways, for example, as 6436371529 + 7077183876 = 80227^2 + 84126^2 .

It is not a de Polignac number, because 13513555405 - 2⁵ = 13513555373 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27578440 + ... + 27578929.

It is an arithmetic number, because the mean of its divisors is an integer number (1571985045).

Almost surely, 2^13513555405 is an apocalyptic number.

It is an amenable number.

13513555405 is a deficient number, since it is larger than the sum of its proper divisors (5350265135).

13513555405 is an equidigital number, since it uses as much as digits as its factorization.

13513555405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55157388 (or 55157381 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 37.

The spelling of 13513555405 in words is "thirteen billion, five hundred thirteen million, five hundred fifty-five thousand, four hundred five".