1666945760 has 48 divisors (see below), whose sum is σ = 3940659072. Its totient is φ = 666355200.

The previous prime is 1666945751. The next prime is 1666945799. The reversal of 1666945760 is 675496661.

It is a junction number, because it is equal to n+sod(n) for n = 1666945699 and 1666945708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412550 + ... + 416570.

It is an arithmetic number, because the mean of its divisors is an integer number (82097064).

Almost surely, 2^1666945760 is an apocalyptic number.

1666945760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666945760 is an abundant number, since it is smaller than the sum of its proper divisors (2273713312).

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

1666945760 is a wasteful number, since it uses less digits than its factorization.

1666945760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6627 (or 6619 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 50.

The square root of 1666945760 is about 40828.2470845859. The cubic root of 1666945760 is about 1185.6972781502.

The spelling of 1666945760 in words is "one billion, six hundred sixty-six million, nine hundred forty-five thousand, seven hundred sixty".