4066906778 has 16 divisors (see below), whose sum is σ = 6723549504. Its totient is φ = 1829535360.

The previous prime is 4066906751. The next prime is 4066906793. The reversal of 4066906778 is 8776096604.

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, 950750 + ... + 955017.

It is an arithmetic number, because the mean of its divisors is an integer number (420221844).

Almost surely, 2^4066906778 is an apocalyptic number.

4066906778 is a deficient number, since it is larger than the sum of its proper divisors (2656642726).

4066906778 is a wasteful number, since it uses less digits than its factorization.

4066906778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905877.

The product of its (nonzero) digits is 3048192, while the sum is 53.

The square root of 4066906778 is about 63772.3041609757. The cubic root of 4066906778 is about 1596.2028155499.

The spelling of 4066906778 in words is "four billion, sixty-six million, nine hundred six thousand, seven hundred seventy-eight".