2001668537 has 8 divisors (see below), whose sum is σ = 2258936640. Its totient is φ = 1756950160.

The previous prime is 2001668509. The next prime is 2001668549. The reversal of 2001668537 is 7358661002.

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 2001668537 - 2²⁰ = 2000619961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2001668537.

It is not an unprimeable number, because it can be changed into a prime (2001668507) 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, 3137093 + ... + 3137730.

It is an arithmetic number, because the mean of its divisors is an integer number (282367080).

Almost surely, 2^2001668537 is an apocalyptic number.

It is an amenable number.

2001668537 is a deficient number, since it is larger than the sum of its proper divisors (257268103).

2001668537 is a wasteful number, since it uses less digits than its factorization.

2001668537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274863.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 2001668537 is about 44740.0104716125. The cubic root of 2001668537 is about 1260.2713233204.

The spelling of 2001668537 in words is "two billion, one million, six hundred sixty-eight thousand, five hundred thirty-seven".