2001668971 has 4 divisors (see below), whose sum is σ = 2017430272. Its totient is φ = 1985907672.

The previous prime is 2001668941. The next prime is 2001669053. The reversal of 2001668971 is 1798661002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001668971 - 2⁵ = 2001668939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001668941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7880460 + ... + 7880713.

It is an arithmetic number, because the mean of its divisors is an integer number (504357568).

Almost surely, 2^2001668971 is an apocalyptic number.

2001668971 is a deficient number, since it is larger than the sum of its proper divisors (15761301).

2001668971 is a wasteful number, since it uses less digits than its factorization.

2001668971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15761300.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 2001668971 is about 44740.0153218570. The cubic root of 2001668971 is about 1260.2714144040.

The spelling of 2001668971 in words is "two billion, one million, six hundred sixty-eight thousand, nine hundred seventy-one".