1666273107 has 8 divisors (see below), whose sum is σ = 2252131984. Its totient is φ = 1095631488.

The previous prime is 1666273073. The next prime is 1666273123. The reversal of 1666273107 is 7013726661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1666273107 - 2⁶ = 1666273043 is a prime.

It is a super-2 number, since 2×1666273107² = 5552932134222866898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1666271107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3804058 + ... + 3804495.

It is an arithmetic number, because the mean of its divisors is an integer number (281516498).

Almost surely, 2^1666273107 is an apocalyptic number.

1666273107 is a deficient number, since it is larger than the sum of its proper divisors (585858877).

1666273107 is an equidigital number, since it uses as much as digits as its factorization.

1666273107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7608629.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 1666273107 is about 40820.0086599697. The cubic root of 1666273107 is about 1185.5377708338.

Adding to 1666273107 its reverse (7013726661), we get a palindrome (8679999768).

The spelling of 1666273107 in words is "one billion, six hundred sixty-six million, two hundred seventy-three thousand, one hundred seven".