4491866078128 has 160 divisors (see below), whose sum is σ = 11230566197760. Its totient is φ = 1707873361920.

The previous prime is 4491866078107. The next prime is 4491866078159. The reversal of 4491866078128 is 8218706681944.

It is a self number, because there is not a number n which added to its sum of digits gives 4491866078128.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1246401 + ... + 3246112.

It is an arithmetic number, because the mean of its divisors is an integer number (70191038736).

Almost surely, 2^{4491866078128} is an apocalyptic number.

It is an amenable number.

4491866078128 is an abundant number, since it is smaller than the sum of its proper divisors (6738700119632).

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

4491866078128 is a wasteful number, since it uses less digits than its factorization.

4491866078128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4492587 (or 4492581 counting only the distinct ones).

The product of its (nonzero) digits is 37158912, while the sum is 64.

The spelling of 4491866078128 in words is "four trillion, four hundred ninety-one billion, eight hundred sixty-six million, seventy-eight thousand, one hundred twenty-eight".