2001220099164 has 144 divisors (see below), whose sum is σ = 6141580133920. Its totient is φ = 559781798400.

The previous prime is 2001220099163. The next prime is 2001220099187. The reversal of 2001220099164 is 4619900221002.

2001220099164 is a `hidden beast` number, since 200 + 1 + 2 + 200 + 99 + 164 = 666.

It is a super-3 number, since 3×2001220099164³ (a number of 38 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001220099163) 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, 5720077 + ... + 6059844.

Almost surely, 2^{2001220099164} is an apocalyptic number.

It is an amenable number.

2001220099164 is an abundant number, since it is smaller than the sum of its proper divisors (4140360034756).

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

2001220099164 is a wasteful number, since it uses less digits than its factorization.

2001220099164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11779969 (or 11779950 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 2001220099164 in words is "two trillion, one billion, two hundred twenty million, ninety-nine thousand, one hundred sixty-four".