20665627606657 has 32 divisors (see below), whose sum is σ = 23091549724800. Its totient is φ = 18335942592000.

The previous prime is 20665627606639. The next prime is 20665627606669. The reversal of 20665627606657 is 75660672656602.

It is not a de Polignac number, because 20665627606657 - 2¹⁵ = 20665627573889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20665627606607) 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, 96973173 + ... + 97186045.

It is an arithmetic number, because the mean of its divisors is an integer number (721610928900).

Almost surely, 2^{20665627606657} is an apocalyptic number.

It is an amenable number.

20665627606657 is a deficient number, since it is larger than the sum of its proper divisors (2425922118143).

20665627606657 is a wasteful number, since it uses less digits than its factorization.

20665627606657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214065.

The product of its (nonzero) digits is 228614400, while the sum is 64.

The spelling of 20665627606657 in words is "twenty trillion, six hundred sixty-five billion, six hundred twenty-seven million, six hundred six thousand, six hundred fifty-seven".