20666200201612 has 72 divisors (see below), whose sum is σ = 42535524595200. Its totient is φ = 8759267748000.

The previous prime is 20666200201609. The next prime is 20666200201639. The reversal of 20666200201612 is 21610200266602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14479639 + ... + 15842737.

Almost surely, 2^{20666200201612} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20666200201612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21267762297600).

20666200201612 is an abundant number, since it is smaller than the sum of its proper divisors (21869324393588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20666200201612 is a wasteful number, since it uses less digits than its factorization.

20666200201612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363971 (or 1363962 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 20666200201612 in words is "twenty trillion, six hundred sixty-six billion, two hundred million, two hundred one thousand, six hundred twelve".