6661778088 has 64 divisors (see below), whose sum is σ = 19123960320. Its totient is φ = 1894334400.

The previous prime is 6661778059. The next prime is 6661778089. The reversal of 6661778088 is 8808771666.

It is not an unprimeable number, because it can be changed into a prime (6661778089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58518 + ... + 129413.

It is an arithmetic number, because the mean of its divisors is an integer number (298811880).

Almost surely, 2^6661778088 is an apocalyptic number.

It is an amenable number.

6661778088 is an abundant number, since it is smaller than the sum of its proper divisors (12462182232).

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

6661778088 is a wasteful number, since it uses less digits than its factorization.

6661778088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188158 (or 188154 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 57.

The square root of 6661778088 is about 81619.7162945327. The cubic root of 6661778088 is about 1881.6119124053.

The spelling of 6661778088 in words is "six billion, six hundred sixty-one million, seven hundred seventy-eight thousand, eighty-eight".