13555556801 has 12 divisors (see below), whose sum is σ = 13943286192. Its totient is φ = 13171479888.

The previous prime is 13555556789. The next prime is 13555556809. The reversal of 13555556801 is 10865555531.

It is a happy number.

It is not a de Polignac number, because 13555556801 - 2¹⁸ = 13555294657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13555556809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1664726 + ... + 1672848.

It is an arithmetic number, because the mean of its divisors is an integer number (1161940516).

Almost surely, 2^13555556801 is an apocalyptic number.

It is an amenable number.

13555556801 is a deficient number, since it is larger than the sum of its proper divisors (387729391).

13555556801 is an frugal number, since it uses more digits than its factorization.

13555556801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8560 (or 8363 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 44.

The spelling of 13555556801 in words is "thirteen billion, five hundred fifty-five million, five hundred fifty-six thousand, eight hundred one".