21766066352 has 20 divisors (see below), whose sum is σ = 42293296776. Its totient is φ = 10851667200.

The previous prime is 21766066349. The next prime is 21766066381. The reversal of 21766066352 is 25366066712.

It is a happy number.

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, 1954649 + ... + 1965752.

Almost surely, 2^21766066352 is an apocalyptic number.

It is an amenable number.

21766066352 is a deficient number, since it is larger than the sum of its proper divisors (20527230424).

21766066352 is a wasteful number, since it uses less digits than its factorization.

21766066352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3920756 (or 3920750 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 44.

The spelling of 21766066352 in words is "twenty-one billion, seven hundred sixty-six million, sixty-six thousand, three hundred fifty-two".