6640474450 has 24 divisors (see below), whose sum is σ = 12356087508. Its totient is φ = 2655156480.

The previous prime is 6640474447. The next prime is 6640474459. The reversal of 6640474450 is 544740466.

It can be written as a sum of positive squares in 6 ways, for example, as 4470125881 + 2170348569 = 66859^2 + 46587^2 .

It is a super-2 number, since 2×6640474450² = 88191801842205605000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6640474459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111174 + ... + 160126.

Almost surely, 2^6640474450 is an apocalyptic number.

6640474450 is a deficient number, since it is larger than the sum of its proper divisors (5715613058).

6640474450 is a wasteful number, since it uses less digits than its factorization.

6640474450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51678 (or 51673 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 40.

The square root of 6640474450 is about 81489.1063271650. The cubic root of 6640474450 is about 1879.6040408369.

The spelling of 6640474450 in words is "six billion, six hundred forty million, four hundred seventy-four thousand, four hundred fifty".