1066221649 has 16 divisors (see below), whose sum is σ = 1141604352. Its totient is φ = 993464208.

The previous prime is 1066221647. The next prime is 1066221659. The reversal of 1066221649 is 9461226601.

It is not a de Polignac number, because 1066221649 - 2¹ = 1066221647 is a prime.

It is a super-3 number, since 3×1066221649³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066221641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238852 + ... + 243274.

It is an arithmetic number, because the mean of its divisors is an integer number (71350272).

Almost surely, 2^1066221649 is an apocalyptic number.

It is an amenable number.

1066221649 is a deficient number, since it is larger than the sum of its proper divisors (75382703).

1066221649 is a wasteful number, since it uses less digits than its factorization.

1066221649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4716.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 1066221649 is about 32653.0496125553. The cubic root of 1066221649 is about 1021.6037979115.

The spelling of 1066221649 in words is "one billion, sixty-six million, two hundred twenty-one thousand, six hundred forty-nine".