6654468778 has 16 divisors (see below), whose sum is σ = 10112256000. Its totient is φ = 3283751952.

The previous prime is 6654468739. The next prime is 6654468803. The reversal of 6654468778 is 8778644566.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 447568 + ... + 462196.

It is an arithmetic number, because the mean of its divisors is an integer number (632016000).

Almost surely, 2^6654468778 is an apocalyptic number.

6654468778 is a deficient number, since it is larger than the sum of its proper divisors (3457787222).

6654468778 is a wasteful number, since it uses less digits than its factorization.

6654468778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17589.

The product of its digits is 54190080, while the sum is 61.

The square root of 6654468778 is about 81574.9273858089. The cubic root of 6654468778 is about 1880.9234917018.

The spelling of 6654468778 in words is "six billion, six hundred fifty-four million, four hundred sixty-eight thousand, seven hundred seventy-eight".