206221979762 has 6 divisors (see below), whose sum is σ = 309333932973. Its totient is φ = 103110668772.

The previous prime is 206221979749. The next prime is 206221979857. The reversal of 206221979762 is 267979122602.

It can be written as a sum of positive squares in 2 ways, for example, as 203428962961 + 2793016801 = 451031^2 + 52849^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=321109.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 481664 + ... + 802772.

Almost surely, 2^206221979762 is an apocalyptic number.

206221979762 is a deficient number, since it is larger than the sum of its proper divisors (103111953211).

206221979762 is an frugal number, since it uses more digits than its factorization.

206221979762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642220 (or 321111 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 206221979762 in words is "two hundred six billion, two hundred twenty-one million, nine hundred seventy-nine thousand, seven hundred sixty-two".