20801371562666 has 32 divisors (see below), whose sum is σ = 32865519960000. Its totient is φ = 9846908277120.

The previous prime is 20801371562659. The next prime is 20801371562707. The reversal of 20801371562666 is 66626517310802.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526610585 + ... + 526650083.

It is an arithmetic number, because the mean of its divisors is an integer number (1027047498750).

Almost surely, 2^{20801371562666} is an apocalyptic number.

20801371562666 is a deficient number, since it is larger than the sum of its proper divisors (12064148397334).

20801371562666 is a wasteful number, since it uses less digits than its factorization.

20801371562666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48134.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 20801371562666 in words is "twenty trillion, eight hundred one billion, three hundred seventy-one million, five hundred sixty-two thousand, six hundred sixty-six".