1666166055 has 16 divisors (see below), whose sum is σ = 2737917024. Its totient is φ = 864604800.

The previous prime is 1666165999. The next prime is 1666166059. The reversal of 1666166055 is 5506616661.

It is not a de Polignac number, because 1666166055 - 2²⁵ = 1632611623 is a prime.

It is a super-2 number, since 2×1666166055² = 5552218645668526050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1666165998 and 1666166016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666166059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1500496 + ... + 1501605.

It is an arithmetic number, because the mean of its divisors is an integer number (171119814).

Almost surely, 2^1666166055 is an apocalyptic number.

1666166055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666166055 is a deficient number, since it is larger than the sum of its proper divisors (1071750969).

1666166055 is a wasteful number, since it uses less digits than its factorization.

1666166055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002146.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 1666166055 is about 40818.6973702003. The cubic root of 1666166055 is about 1185.5123814570.

The spelling of 1666166055 in words is "one billion, six hundred sixty-six million, one hundred sixty-six thousand, fifty-five".