20210665205570 has 32 divisors (see below), whose sum is σ = 42460826116608. Its totient is φ = 6781937502528.

The previous prime is 20210665205501. The next prime is 20210665205659. The reversal of 20210665205570 is 7550256601202.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 3071526377 + ... + 3071532956.

It is an arithmetic number, because the mean of its divisors is an integer number (1326900816144).

Almost surely, 2^{20210665205570} is an apocalyptic number.

20210665205570 is an abundant number, since it is smaller than the sum of its proper divisors (22250160911038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20210665205570 is a wasteful number, since it uses less digits than its factorization.

20210665205570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6143059394.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 20210665205570 in words is "twenty trillion, two hundred ten billion, six hundred sixty-five million, two hundred five thousand, five hundred seventy".