1666166560 has 24 divisors (see below), whose sum is σ = 3936318876. Its totient is φ = 666466560.

The previous prime is 1666166543. The next prime is 1666166561. The reversal of 1666166560 is 656616661.

It can be written as a sum of positive squares in 2 ways, for example, as 1578631824 + 87534736 = 39732^2 + 9356^2 .

It is a super-2 number, since 2×1666166560² = 5552222011324467200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666166561) 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, 5206611 + ... + 5206930.

Almost surely, 2^1666166560 is an apocalyptic number.

1666166560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666166560 is an abundant number, since it is smaller than the sum of its proper divisors (2270152316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666166560 is a wasteful number, since it uses less digits than its factorization.

1666166560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10413556 (or 10413548 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 1666166560 is about 40818.7035560906. The cubic root of 1666166560 is about 1185.5125012297.

The spelling of 1666166560 in words is "one billion, six hundred sixty-six million, one hundred sixty-six thousand, five hundred sixty".