1990668571 has 8 divisors (see below), whose sum is σ = 2028002144. Its totient is φ = 1953486720.

The previous prime is 1990668481. The next prime is 1990668587. The reversal of 1990668571 is 1758660991.

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 1990668571 - 2⁷ = 1990668443 is a prime.

It is a super-2 number, since 2×1990668571² = 7925522719134364082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990668371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11271 + ... + 64096.

It is an arithmetic number, because the mean of its divisors is an integer number (253500268).

Almost surely, 2^1990668571 is an apocalyptic number.

1990668571 is a deficient number, since it is larger than the sum of its proper divisors (37333573).

1990668571 is an equidigital number, since it uses as much as digits as its factorization.

1990668571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75861.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 1990668571 is about 44616.9090256149. The cubic root of 1990668571 is about 1257.9585172134.

The spelling of 1990668571 in words is "one billion, nine hundred ninety million, six hundred sixty-eight thousand, five hundred seventy-one".