6450666040 has 256 divisors, whose sum is σ = 18844358400. Its totient is φ = 1932263424.

The previous prime is 6450666029. The next prime is 6450666071. The reversal of 6450666040 is 406660546.

It is a super-2 number, since 2×6450666040² = 83222184719218563200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5594104 + ... + 5595256.

It is an arithmetic number, because the mean of its divisors is an integer number (73610775).

Almost surely, 2^6450666040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6450666040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9422179200).

6450666040 is an abundant number, since it is smaller than the sum of its proper divisors (12393692360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6450666040 is a wasteful number, since it uses less digits than its factorization.

6450666040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1262 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 6450666040 is about 80316.0384979239. The cubic root of 6450666040 is about 1861.5220554930.

The spelling of 6450666040 in words is "six billion, four hundred fifty million, six hundred sixty-six thousand, forty".