2001656590 has 8 divisors (see below), whose sum is σ = 3602981880. Its totient is φ = 800662632.

The previous prime is 2001656567. The next prime is 2001656603. The reversal of 2001656590 is 956561002.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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, 100082820 + ... + 100082839.

It is an arithmetic number, because the mean of its divisors is an integer number (450372735).

Almost surely, 2^2001656590 is an apocalyptic number.

2001656590 is a deficient number, since it is larger than the sum of its proper divisors (1601325290).

2001656590 is a wasteful number, since it uses less digits than its factorization.

2001656590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200165666.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 2001656590 is about 44739.8769555751. The cubic root of 2001656590 is about 1260.2688159969.

The spelling of 2001656590 in words is "two billion, one million, six hundred fifty-six thousand, five hundred ninety".