6605680445 has 24 divisors (see below), whose sum is σ = 9930302424. Its totient is φ = 4181175936.

The previous prime is 6605680409. The next prime is 6605680489. The reversal of 6605680445 is 5440865066.

It can be written as a sum of positive squares in 4 ways, for example, as 802135684 + 5803544761 = 28322^2 + 76181^2 .

It is not a de Polignac number, because 6605680445 - 2²⁴ = 6588903229 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6605680396 and 6605680405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1033814 + ... + 1040183.

It is an arithmetic number, because the mean of its divisors is an integer number (413762601).

Almost surely, 2^6605680445 is an apocalyptic number.

6605680445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6605680445 is a deficient number, since it is larger than the sum of its proper divisors (3324621979).

6605680445 is a wasteful number, since it uses less digits than its factorization.

6605680445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2074029 (or 2074022 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The square root of 6605680445 is about 81275.3372493772. The cubic root of 6605680445 is about 1876.3154450250.

The spelling of 6605680445 in words is "six billion, six hundred five million, six hundred eighty thousand, four hundred forty-five".