201999866540388 has 192 divisors, whose sum is σ = 551200224153600. Its totient is φ = 56383638405120.

The previous prime is 201999866540369. The next prime is 201999866540389. The reversal of 201999866540388 is 883045668999102.

201999866540388 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (201999866540389) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4046365668 + ... + 4046415588.

It is an arithmetic number, because the mean of its divisors is an integer number (2870834500800).

Almost surely, 2^{201999866540388} is an apocalyptic number.

201999866540388 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201999866540388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275600112076800).

201999866540388 is an abundant number, since it is smaller than the sum of its proper divisors (349200357613212).

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

201999866540388 is a wasteful number, since it uses less digits than its factorization.

201999866540388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55050 (or 55048 counting only the distinct ones).

The product of its (nonzero) digits is 1612431360, while the sum is 78.

The spelling of 201999866540388 in words is "two hundred one trillion, nine hundred ninety-nine billion, eight hundred sixty-six million, five hundred forty thousand, three hundred eighty-eight".