6660245778 has 48 divisors (see below), whose sum is σ = 13839222528. Its totient is φ = 2134641600.

The previous prime is 6660245773. The next prime is 6660245797. The reversal of 6660245778 is 8775420666.

It is a self number, because there is not a number n which added to its sum of digits gives 6660245778.

It is not an unprimeable number, because it can be changed into a prime (6660245773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6093000 + ... + 6094092.

It is an arithmetic number, because the mean of its divisors is an integer number (288317136).

Almost surely, 2^6660245778 is an apocalyptic number.

6660245778 is an abundant number, since it is smaller than the sum of its proper divisors (7178976750).

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

6660245778 is a wasteful number, since it uses less digits than its factorization.

6660245778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491 (or 1310 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 51.

The square root of 6660245778 is about 81610.3288683485. The cubic root of 6660245778 is about 1881.4676349166.

The spelling of 6660245778 in words is "six billion, six hundred sixty million, two hundred forty-five thousand, seven hundred seventy-eight".