1649670228666 has 64 divisors (see below), whose sum is σ = 3691891353600. Its totient is φ = 546009731568.

The previous prime is 1649670228631. The next prime is 1649670228707. The reversal of 1649670228666 is 6668220769461.

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, 4294201 + ... + 4662563.

It is an arithmetic number, because the mean of its divisors is an integer number (57685802400).

Almost surely, 2^{1649670228666} is an apocalyptic number.

1649670228666 is an abundant number, since it is smaller than the sum of its proper divisors (2042221124934).

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

1649670228666 is a wasteful number, since it uses less digits than its factorization.

1649670228666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368960 (or 368954 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 63.

The spelling of 1649670228666 in words is "one trillion, six hundred forty-nine billion, six hundred seventy million, two hundred twenty-eight thousand, six hundred sixty-six".