1666264055 has 8 divisors (see below), whose sum is σ = 2026907952. Its totient is φ = 1314750528.

The previous prime is 1666264051. The next prime is 1666264087. The reversal of 1666264055 is 5504626661.

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

It is a cyclic number.

It is not a de Polignac number, because 1666264055 - 2² = 1666264051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666264051) 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, 2282189 + ... + 2282918.

It is an arithmetic number, because the mean of its divisors is an integer number (253363494).

Almost surely, 2^1666264055 is an apocalyptic number.

1666264055 is a deficient number, since it is larger than the sum of its proper divisors (360643897).

1666264055 is an equidigital number, since it uses as much as digits as its factorization.

1666264055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4565185.

The product of its (nonzero) digits is 259200, while the sum is 41.

The square root of 1666264055 is about 40819.8977828216. The cubic root of 1666264055 is about 1185.5356240254.

The spelling of 1666264055 in words is "one billion, six hundred sixty-six million, two hundred sixty-four thousand, fifty-five".