1111001661166 has 4 divisors (see below), whose sum is σ = 1666502491752. Its totient is φ = 555500830582.

The previous prime is 1111001660969. The next prime is 1111001661169. The reversal of 1111001661166 is 6611661001111.

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

It is a super-2 number, since 2×1111001661166² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111001661169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277750415290 + ... + 277750415293.

It is an arithmetic number, because the mean of its divisors is an integer number (416625622938).

Almost surely, 2^{1111001661166} is an apocalyptic number.

1111001661166 is a deficient number, since it is larger than the sum of its proper divisors (555500830586).

1111001661166 is an equidigital number, since it uses as much as digits as its factorization.

1111001661166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555500830585.

The product of its (nonzero) digits is 1296, while the sum is 31.

Adding to 1111001661166 its reverse (6611661001111), we get a palindrome (7722662662277).

The spelling of 1111001661166 in words is "one trillion, one hundred eleven billion, one million, six hundred sixty-one thousand, one hundred sixty-six".