201278022660 has 672 divisors, whose sum is σ = 783868821120. Its totient is φ = 42662246400.

The previous prime is 201278022653. The next prime is 201278022677. The reversal of 201278022660 is 66220872102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 39611320 + ... + 39616400.

It is an arithmetic number, because the mean of its divisors is an integer number (1166471460).

Almost surely, 2^201278022660 is an apocalyptic number.

201278022660 is a gapful number since it is divisible by the number (20) 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 201278022660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391934410560).

201278022660 is an abundant number, since it is smaller than the sum of its proper divisors (582590798460).

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

201278022660 is a wasteful number, since it uses less digits than its factorization.

201278022660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5151 (or 5134 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

Adding to 201278022660 its reverse (66220872102), we get a palindrome (267498894762).

The spelling of 201278022660 in words is "two hundred one billion, two hundred seventy-eight million, twenty-two thousand, six hundred sixty".