1166517903 has 4 divisors (see below), whose sum is σ = 1555357208. Its totient is φ = 777678600.

The previous prime is 1166517893. The next prime is 1166517923. The reversal of 1166517903 is 3097156611.

It is a happy number.

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

It is not a de Polignac number, because 1166517903 - 2¹⁸ = 1166255759 is a prime.

It is a super-3 number, since 3×1166517903³ (a number of 28 digits) contains 333 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 (1166517923) 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, 194419648 + ... + 194419653.

It is an arithmetic number, because the mean of its divisors is an integer number (388839302).

Almost surely, 2^1166517903 is an apocalyptic number.

1166517903 is a deficient number, since it is larger than the sum of its proper divisors (388839305).

1166517903 is an equidigital number, since it uses as much as digits as its factorization.

1166517903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388839304.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 1166517903 is about 34154.3248066771. The cubic root of 1166517903 is about 1052.6818527163.

The spelling of 1166517903 in words is "one billion, one hundred sixty-six million, five hundred seventeen thousand, nine hundred three".