1166621611 has 8 divisors (see below), whose sum is σ = 1170135360. Its totient is φ = 1163114568.

The previous prime is 1166621593. The next prime is 1166621633. The reversal of 1166621611 is 1161266611.

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 1166621611 - 2¹⁷ = 1166490539 is a prime.

It is a super-3 number, since 3×1166621611³ (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 (1166621671) 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, 699000 + ... + 700666.

It is an arithmetic number, because the mean of its divisors is an integer number (146266920).

Almost surely, 2^1166621611 is an apocalyptic number.

1166621611 is a deficient number, since it is larger than the sum of its proper divisors (3513749).

1166621611 is an equidigital number, since it uses as much as digits as its factorization.

1166621611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3353.

The product of its digits is 2592, while the sum is 31.

The square root of 1166621611 is about 34155.8429994049. The cubic root of 1166621611 is about 1052.7130476353.

The spelling of 1166621611 in words is "one billion, one hundred sixty-six million, six hundred twenty-one thousand, six hundred eleven".