2020656431666 has 4 divisors (see below), whose sum is σ = 3030984647502. Its totient is φ = 1010328215832.

The previous prime is 2020656431621. The next prime is 2020656431687. The reversal of 2020656431666 is 6661346560202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1924476435025 + 96179996641 = 1387255^2 + 310129^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2020656431666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505164107915 + ... + 505164107918.

Almost surely, 2^{2020656431666} is an apocalyptic number.

2020656431666 is a deficient number, since it is larger than the sum of its proper divisors (1010328215836).

2020656431666 is a wasteful number, since it uses less digits than its factorization.

2020656431666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010328215835.

The product of its (nonzero) digits is 1866240, while the sum is 47.

The spelling of 2020656431666 in words is "two trillion, twenty billion, six hundred fifty-six million, four hundred thirty-one thousand, six hundred sixty-six".