13555555509 has 8 divisors (see below), whose sum is σ = 18075068032. Its totient is φ = 9036540000.

The previous prime is 13555555483. The next prime is 13555555537. The reversal of 13555555509 is 90555555531.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13555555509 - 2⁵ = 13555555477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13555555549) 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, 55117 + ... + 173634.

It is an arithmetic number, because the mean of its divisors is an integer number (2259383504).

Almost surely, 2^13555555509 is an apocalyptic number.

It is an amenable number.

13555555509 is a deficient number, since it is larger than the sum of its proper divisors (4519512523).

13555555509 is a wasteful number, since it uses less digits than its factorization.

13555555509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248507.

The product of its (nonzero) digits is 2109375, while the sum is 48.

The spelling of 13555555509 in words is "thirteen billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred nine".