20801375510666 has 8 divisors (see below), whose sum is σ = 31203251949504. Its totient is φ = 10400291527500.

The previous prime is 20801375510659. The next prime is 20801375510681. The reversal of 20801375510666 is 66601557310802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198048290 + ... + 198153293.

It is an arithmetic number, because the mean of its divisors is an integer number (3900406493688).

Almost surely, 2^{20801375510666} is an apocalyptic number.

20801375510666 is a deficient number, since it is larger than the sum of its proper divisors (10401876438838).

20801375510666 is a wasteful number, since it uses less digits than its factorization.

20801375510666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396227836.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 20801375510666 in words is "twenty trillion, eight hundred one billion, three hundred seventy-five million, five hundred ten thousand, six hundred sixty-six".