201668721912 has 192 divisors, whose sum is σ = 629848327680. Its totient is φ = 57101780736.

The previous prime is 201668721907. The next prime is 201668721913. The reversal of 201668721912 is 219127866102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201668721913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26108883 + ... + 26116605.

It is an arithmetic number, because the mean of its divisors is an integer number (3280460040).

Almost surely, 2^201668721912 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 201668721912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (314924163840).

201668721912 is an abundant number, since it is smaller than the sum of its proper divisors (428179605768).

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

201668721912 is a wasteful number, since it uses less digits than its factorization.

201668721912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8202 (or 8195 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 201668721912 in words is "two hundred one billion, six hundred sixty-eight million, seven hundred twenty-one thousand, nine hundred twelve".