6646074145 has 4 divisors (see below), whose sum is σ = 7975288980. Its totient is φ = 5316859312.

The previous prime is 6646074121. The next prime is 6646074161. The reversal of 6646074145 is 5414706466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1132120609 + 5513953536 = 33647^2 + 74256^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646074145 - 2⁹ = 6646073633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664607410 + ... + 664607419.

It is an arithmetic number, because the mean of its divisors is an integer number (1993822245).

Almost surely, 2^6646074145 is an apocalyptic number.

It is an amenable number.

6646074145 is a deficient number, since it is larger than the sum of its proper divisors (1329214835).

6646074145 is a wasteful number, since it uses less digits than its factorization.

6646074145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329214834.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 6646074145 is about 81523.4576364374. The cubic root of 6646074145 is about 1880.1322286089.

The spelling of 6646074145 in words is "six billion, six hundred forty-six million, seventy-four thousand, one hundred forty-five".