1649209653680 has 20 divisors (see below), whose sum is σ = 3834412444992. Its totient is φ = 659683861440.

The previous prime is 1649209653667. The next prime is 1649209653731. The reversal of 1649209653680 is 863569029461.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10307560256 + ... + 10307560415.

Almost surely, 2^{1649209653680} is an apocalyptic number.

1649209653680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1649209653680 is an abundant number, since it is smaller than the sum of its proper divisors (2185202791312).

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

1649209653680 is a wasteful number, since it uses less digits than its factorization.

1649209653680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20615120684 (or 20615120678 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 59.

The spelling of 1649209653680 in words is "one trillion, six hundred forty-nine billion, two hundred nine million, six hundred fifty-three thousand, six hundred eighty".