6405078666 has 32 divisors (see below), whose sum is σ = 14643877248. Its totient is φ = 1829560320.

The previous prime is 6405078637. The next prime is 6405078677. The reversal of 6405078666 is 6668705046.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171186 + ... + 205218.

It is an arithmetic number, because the mean of its divisors is an integer number (457621164).

Almost surely, 2^6405078666 is an apocalyptic number.

6405078666 is an abundant number, since it is smaller than the sum of its proper divisors (8238798582).

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

6405078666 is a wasteful number, since it uses less digits than its factorization.

6405078666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38526.

The product of its (nonzero) digits is 1451520, while the sum is 48.

The square root of 6405078666 is about 80031.7353679151. The cubic root of 6405078666 is about 1857.1265094188.

The spelling of 6405078666 in words is "six billion, four hundred five million, seventy-eight thousand, six hundred sixty-six".