5666644945 has 16 divisors (see below), whose sum is σ = 7344061200. Its totient is φ = 4172592384.

The previous prime is 5666644943. The next prime is 5666644967. The reversal of 5666644945 is 5494466665.

It can be written as a sum of positive squares in 8 ways, for example, as 188128656 + 5478516289 = 13716^2 + 74017^2 .

It is a cyclic number.

It is not a de Polignac number, because 5666644945 - 2¹ = 5666644943 is a prime.

It is a super-2 number, since 2×5666644945² = 64221729865388106050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5666644943) 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, 102214 + ... + 147583.

It is an arithmetic number, because the mean of its divisors is an integer number (459003825).

Almost surely, 2^5666644945 is an apocalyptic number.

It is an amenable number.

5666644945 is a deficient number, since it is larger than the sum of its proper divisors (1677416255).

5666644945 is a wasteful number, since it uses less digits than its factorization.

5666644945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250164.

The product of its digits is 18662400, while the sum is 55.

The square root of 5666644945 is about 75277.1209930348. The cubic root of 5666644945 is about 1782.8248024116.

The spelling of 5666644945 in words is "five billion, six hundred sixty-six million, six hundred forty-four thousand, nine hundred forty-five".