13555744417 has 6 divisors (see below), whose sum is σ = 13742448018. Its totient is φ = 13369068144.

The previous prime is 13555744339. The next prime is 13555744441. The reversal of 13555744417 is 71444755531.

It can be written as a sum of positive squares in only one way, i.e., 11884488256 + 1671256161 = 109016^2 + 40881^2 .

It is not a de Polignac number, because 13555744417 - 2⁷ = 13555744289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13555774417) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 987958 + ... + 1001584.

It is an arithmetic number, because the mean of its divisors is an integer number (2290408003).

Almost surely, 2^13555744417 is an apocalyptic number.

It is an amenable number.

13555744417 is a deficient number, since it is larger than the sum of its proper divisors (186703601).

13555744417 is an frugal number, since it uses more digits than its factorization.

13555744417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27327 (or 13700 counting only the distinct ones).

The product of its digits is 1176000, while the sum is 46.

The spelling of 13555744417 in words is "thirteen billion, five hundred fifty-five million, seven hundred forty-four thousand, four hundred seventeen".