1668956611 has 6 divisors (see below), whose sum is σ = 1941439380. Its totient is φ = 1430534196.

The previous prime is 1668956609. The next prime is 1668956621. The reversal of 1668956611 is 1166598661.

It is not a de Polignac number, because 1668956611 - 2¹ = 1668956609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 34060339 = 1668956611 / (1 + 6 + 6 + 8 + 9 + 5 + 6 + 6 + 1 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668956621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17030121 + ... + 17030218.

It is an arithmetic number, because the mean of its divisors is an integer number (323573230).

Almost surely, 2^1668956611 is an apocalyptic number.

1668956611 is a deficient number, since it is larger than the sum of its proper divisors (272482769).

1668956611 is an equidigital number, since it uses as much as digits as its factorization.

1668956611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34060353 (or 34060346 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 1668956611 is about 40852.8653952204. The cubic root of 1668956611 is about 1186.1738588402.

The spelling of 1668956611 in words is "one billion, six hundred sixty-eight million, nine hundred fifty-six thousand, six hundred eleven".