21660535556546 has 16 divisors (see below), whose sum is σ = 33987994236288. Its totient is φ = 10333552680000.

The previous prime is 21660535556479. The next prime is 21660535556551. The reversal of 21660535556546 is 64565553506612.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 587115230 + ... + 587152121.

It is an arithmetic number, because the mean of its divisors is an integer number (2124249639768).

Almost surely, 2^{21660535556546} is an apocalyptic number.

21660535556546 is a deficient number, since it is larger than the sum of its proper divisors (12327458679742).

21660535556546 is a wasteful number, since it uses less digits than its factorization.

21660535556546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174267777.

The product of its (nonzero) digits is 97200000, while the sum is 59.

The spelling of 21660535556546 in words is "twenty-one trillion, six hundred sixty billion, five hundred thirty-five million, five hundred fifty-six thousand, five hundred forty-six".