20661301391185 has 32 divisors (see below), whose sum is σ = 31137911078400. Its totient is φ = 13077922624704.

The previous prime is 20661301391141. The next prime is 20661301391189. The reversal of 20661301391185 is 58119310316602.

It is not a de Polignac number, because 20661301391185 - 2⁹ = 20661301390673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20661301391189) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 463339477 + ... + 463384066.

It is an arithmetic number, because the mean of its divisors is an integer number (973059721200).

Almost surely, 2^{20661301391185} is an apocalyptic number.

It is an amenable number.

20661301391185 is a deficient number, since it is larger than the sum of its proper divisors (10476609687215).

20661301391185 is an equidigital number, since it uses as much as digits as its factorization.

20661301391185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926723582 (or 926723568 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 20661301391185 in words is "twenty trillion, six hundred sixty-one billion, three hundred one million, three hundred ninety-one thousand, one hundred eighty-five".