2001156641 has 8 divisors (see below), whose sum is σ = 2183705568. Its totient is φ = 1818712000.

The previous prime is 2001156613. The next prime is 2001156673. The reversal of 2001156641 is 1466511002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2001156641 - 2¹⁴ = 2001140257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001156641.

It is not an unprimeable number, because it can be changed into a prime (2001156611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17186 + ... + 65556.

It is an arithmetic number, because the mean of its divisors is an integer number (272963196).

Almost surely, 2^2001156641 is an apocalyptic number.

It is an amenable number.

2001156641 is a deficient number, since it is larger than the sum of its proper divisors (182548927).

2001156641 is a wasteful number, since it uses less digits than its factorization.

2001156641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52143.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 2001156641 is about 44734.2893203860. The cubic root of 2001156641 is about 1260.1638824797.

Adding to 2001156641 its reverse (1466511002), we get a palindrome (3467667643).

The spelling of 2001156641 in words is "two billion, one million, one hundred fifty-six thousand, six hundred forty-one".