201643001055 has 12 divisors (see below), whose sum is σ = 349514535240. Its totient is φ = 107542933872.

The previous prime is 201643001011. The next prime is 201643001111. The reversal of 201643001055 is 550100346102.

201643001055 is a `hidden beast` number, since 2 + 0 + 1 + 643 + 0 + 0 + 10 + 5 + 5 = 666.

It is not a de Polignac number, because 201643001055 - 2⁷ = 201643000927 is a prime.

It is a super-2 number, since 2×201643001055² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2240477745 + ... + 2240477834.

It is an arithmetic number, because the mean of its divisors is an integer number (29126211270).

Almost surely, 2^201643001055 is an apocalyptic number.

201643001055 is a deficient number, since it is larger than the sum of its proper divisors (147871534185).

201643001055 is a wasteful number, since it uses less digits than its factorization.

201643001055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480955590 (or 4480955587 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 201643001055 its reverse (550100346102), we get a palindrome (751743347157).

The spelling of 201643001055 in words is "two hundred one billion, six hundred forty-three million, one thousand, fifty-five".