2001355650 has 72 divisors (see below), whose sum is σ = 6145124544. Its totient is φ = 457452000.

The previous prime is 2001355639. The next prime is 2001355679. The reversal of 2001355650 is 565531002.

2001355650 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 5 + 5 + 650 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 314526 + ... + 320825.

It is an arithmetic number, because the mean of its divisors is an integer number (85348952).

Almost surely, 2^2001355650 is an apocalyptic number.

2001355650 is an abundant number, since it is smaller than the sum of its proper divisors (4143768894).

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

2001355650 is a wasteful number, since it uses less digits than its factorization.

2001355650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635376 (or 635368 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 2001355650 is about 44736.5136102491. The cubic root of 2001355650 is about 1260.2056542625.

Adding to 2001355650 its reverse (565531002), we get a palindrome (2566886652).

The spelling of 2001355650 in words is "two billion, one million, three hundred fifty-five thousand, six hundred fifty".