1166634641 has 4 divisors (see below), whose sum is σ = 1167618672. Its totient is φ = 1165650612.

The previous prime is 1166634631. The next prime is 1166634643. The reversal of 1166634641 is 1464366611.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1464366611 = 97 ⋅15096563.

It is a cyclic number.

It is not a de Polignac number, because 1166634641 - 2³⁰ = 92892817 is a prime.

It is a super-2 number, since 2×1166634641² = 2722072771162397762, 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 = 1166634595 and 1166634604.

It is not an unprimeable number, because it can be changed into a prime (1166634643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490235 + ... + 492608.

It is an arithmetic number, because the mean of its divisors is an integer number (291904668).

Almost surely, 2^1166634641 is an apocalyptic number.

It is an amenable number.

1166634641 is a deficient number, since it is larger than the sum of its proper divisors (984031).

1166634641 is an equidigital number, since it uses as much as digits as its factorization.

1166634641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984030.

The product of its digits is 62208, while the sum is 38.

The square root of 1166634641 is about 34156.0337422248. The cubic root of 1166634641 is about 1052.7169668723.

The spelling of 1166634641 in words is "one billion, one hundred sixty-six million, six hundred thirty-four thousand, six hundred forty-one".