20166205172 has 12 divisors (see below), whose sum is σ = 35295414756. Its totient is φ = 10081800960.

The previous prime is 20166205151. The next prime is 20166205181. The reversal of 20166205172 is 27150266102.

It can be written as a sum of positive squares in 2 ways, for example, as 7205293456 + 12960911716 = 84884^2 + 113846^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290123 + ... + 352850.

It is an arithmetic number, because the mean of its divisors is an integer number (2941284563).

Almost surely, 2^20166205172 is an apocalyptic number.

It is an amenable number.

20166205172 is a deficient number, since it is larger than the sum of its proper divisors (15129209584).

20166205172 is a wasteful number, since it uses less digits than its factorization.

20166205172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650818 (or 650816 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The spelling of 20166205172 in words is "twenty billion, one hundred sixty-six million, two hundred five thousand, one hundred seventy-two".