20661701066 has 16 divisors (see below), whose sum is σ = 32469815040. Its totient is φ = 9848377440.

The previous prime is 20661701051. The next prime is 20661701131. The reversal of 20661701066 is 66010716602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2482811 + ... + 2491118.

It is an arithmetic number, because the mean of its divisors is an integer number (2029363440).

Almost surely, 2^20661701066 is an apocalyptic number.

20661701066 is a deficient number, since it is larger than the sum of its proper divisors (11808113974).

20661701066 is a wasteful number, since it uses less digits than its factorization.

20661701066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4974029.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 20661701066 in words is "twenty billion, six hundred sixty-one million, seven hundred one thousand, sixty-six".