13540021555 has 16 divisors (see below), whose sum is σ = 17165934720. Its totient is φ = 10235972992.

The previous prime is 13540021543. The next prime is 13540021591. The reversal of 13540021555 is 55512004531.

It is a cyclic number.

It is not a de Polignac number, because 13540021555 - 2⁹ = 13540021043 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986584 + ... + 1000213.

It is an arithmetic number, because the mean of its divisors is an integer number (1072870920).

Almost surely, 2^13540021555 is an apocalyptic number.

13540021555 is a deficient number, since it is larger than the sum of its proper divisors (3625913165).

13540021555 is a wasteful number, since it uses less digits than its factorization.

13540021555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986878.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 13540021555 in words is "thirteen billion, five hundred forty million, twenty-one thousand, five hundred fifty-five".