1166636645 has 24 divisors (see below), whose sum is σ = 1490494824. Its totient is φ = 876440576.

The previous prime is 1166636633. The next prime is 1166636657. The reversal of 1166636645 is 5466366611.

It is an interprime number because it is at equal distance from previous prime (1166636633) and next prime (1166636657).

It can be written as a sum of positive squares in 12 ways, for example, as 314814049 + 851822596 = 17743^2 + 29186^2 .

It is not a de Polignac number, because 1166636645 - 2¹⁰ = 1166635621 is a prime.

It is a super-2 number, since 2×1166636645² = 2722082122913712050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1166636596 and 1166636605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1151159 + ... + 1152171.

It is an arithmetic number, because the mean of its divisors is an integer number (62103951).

Almost surely, 2^1166636645 is an apocalyptic number.

It is an amenable number.

1166636645 is a deficient number, since it is larger than the sum of its proper divisors (323858179).

1166636645 is a wasteful number, since it uses less digits than its factorization.

1166636645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849 (or 1832 counting only the distinct ones).

The product of its digits is 466560, while the sum is 44.

The square root of 1166636645 is about 34156.0630781711. The cubic root of 1166636645 is about 1052.7175696442.

The spelling of 1166636645 in words is "one billion, one hundred sixty-six million, six hundred thirty-six thousand, six hundred forty-five".