20046656666 has 12 divisors (see below), whose sum is σ = 31942856958. Its totient is φ = 9433720512.

The previous prime is 20046656639. The next prime is 20046656681. The reversal of 20046656666 is 66665664002.

It can be written as a sum of positive squares in 3 ways, for example, as 19840131025 + 206525641 = 140855^2 + 14371^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20046656666.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17340821 + ... + 17341976.

Almost surely, 2^20046656666 is an apocalyptic number.

20046656666 is a deficient number, since it is larger than the sum of its proper divisors (11896200292).

20046656666 is a wasteful number, since it uses less digits than its factorization.

20046656666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34682833 (or 34682816 counting only the distinct ones).

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

The spelling of 20046656666 in words is "twenty billion, forty-six million, six hundred fifty-six thousand, six hundred sixty-six".