1171665545 has 4 divisors (see below), whose sum is σ = 1405998660. Its totient is φ = 937332432.

The previous prime is 1171665499. The next prime is 1171665587. The reversal of 1171665545 is 5455661711.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 410953984 + 760711561 = 20272^2 + 27581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171665545 - 2¹⁴ = 1171649161 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117166550 + ... + 117166559.

It is an arithmetic number, because the mean of its divisors is an integer number (351499665).

Almost surely, 2^1171665545 is an apocalyptic number.

It is an amenable number.

1171665545 is a deficient number, since it is larger than the sum of its proper divisors (234333115).

1171665545 is an equidigital number, since it uses as much as digits as its factorization.

1171665545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234333114.

The product of its digits is 126000, while the sum is 41.

The square root of 1171665545 is about 34229.6004212728. The cubic root of 1171665545 is about 1054.2280150174.

The spelling of 1171665545 in words is "one billion, one hundred seventy-one million, six hundred sixty-five thousand, five hundred forty-five".