201643645104 has 160 divisors (see below), whose sum is σ = 631703854080. Its totient is φ = 61075641600.

The previous prime is 201643645097. The next prime is 201643645109. The reversal of 201643645104 is 401546346102.

201643645104 is a `hidden beast` number, since 2 + 0 + 1 + 6 + 4 + 3 + 645 + 1 + 0 + 4 = 666.

It is a super-2 number, since 2×201643645104² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (201643645109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11619474 + ... + 11636814.

It is an arithmetic number, because the mean of its divisors is an integer number (3948149088).

Almost surely, 2^201643645104 is an apocalyptic number.

201643645104 is a gapful number since it is divisible by the number (24) 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 201643645104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315851927040).

201643645104 is an abundant number, since it is smaller than the sum of its proper divisors (430060208976).

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

201643645104 is a wasteful number, since it uses less digits than its factorization.

201643645104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19816 (or 19804 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The spelling of 201643645104 in words is "two hundred one billion, six hundred forty-three million, six hundred forty-five thousand, one hundred four".