1091666669 has 4 divisors (see below), whose sum is σ = 1092098496. Its totient is φ = 1091234844.

The previous prime is 1091666657. The next prime is 1091666683. The reversal of 1091666669 is 9666661901.

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.

It is a cyclic number.

It is not a de Polignac number, because 1091666669 - 2²⁰ = 1090618093 is a prime.

It is a super-2 number, since 2×1091666669² = 2383472232411111122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091666629) 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, 212099 + ... + 217184.

It is an arithmetic number, because the mean of its divisors is an integer number (273024624).

Almost surely, 2^1091666669 is an apocalyptic number.

It is an amenable number.

1091666669 is a deficient number, since it is larger than the sum of its proper divisors (431827).

1091666669 is an equidigital number, since it uses as much as digits as its factorization.

1091666669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431826.

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 1091666669 is about 33040.3793713087. The cubic root of 1091666669 is about 1029.6667376284. Note that the first 3 decimals are identical.

The spelling of 1091666669 in words is "one billion, ninety-one million, six hundred sixty-six thousand, six hundred sixty-nine".