8065644778 has 16 divisors (see below), whose sum is σ = 12614215680. Its totient is φ = 3863096496.

The previous prime is 8065644773. The next prime is 8065644787. The reversal of 8065644778 is 8774465608.

It is not an unprimeable number, because it can be changed into a prime (8065644773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540126 + ... + 554857.

It is an arithmetic number, because the mean of its divisors is an integer number (788388480).

Almost surely, 2^8065644778 is an apocalyptic number.

8065644778 is a deficient number, since it is larger than the sum of its proper divisors (4548570902).

8065644778 is a wasteful number, since it uses less digits than its factorization.

8065644778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095141.

The product of its (nonzero) digits is 9031680, while the sum is 55.

The square root of 8065644778 is about 89808.9348450364. The cubic root of 8065644778 is about 2005.4555033773.

The spelling of 8065644778 in words is "eight billion, sixty-five million, six hundred forty-four thousand, seven hundred seventy-eight".