6665555445 has 16 divisors (see below), whose sum is σ = 10665914112. Its totient is φ = 3554621120.

The previous prime is 6665555417. The next prime is 6665555447. The reversal of 6665555445 is 5445555666.

It is not a de Polignac number, because 6665555445 - 2⁹ = 6665554933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665555447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256135 + ... + 280955.

It is an arithmetic number, because the mean of its divisors is an integer number (666619632).

Almost surely, 2^6665555445 is an apocalyptic number.

It is an amenable number.

6665555445 is a deficient number, since it is larger than the sum of its proper divisors (4000358667).

6665555445 is a wasteful number, since it uses less digits than its factorization.

6665555445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42732.

The product of its digits is 10800000, while the sum is 51.

The square root of 6665555445 is about 81642.8529940006. The cubic root of 6665555445 is about 1881.9674819891.

It can be divided in two parts, 666 and 5555445, that added together give a triangular number (5556111 = T₃₃₃₃).

The spelling of 6665555445 in words is "six billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred forty-five".