1666560406 has 8 divisors (see below), whose sum is σ = 2856960720. Its totient is φ = 714240168.

The previous prime is 1666560397. The next prime is 1666560409. The reversal of 1666560406 is 6040656661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666560409) 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, 59520001 + ... + 59520028.

It is an arithmetic number, because the mean of its divisors is an integer number (357120090).

Almost surely, 2^1666560406 is an apocalyptic number.

1666560406 is a deficient number, since it is larger than the sum of its proper divisors (1190400314).

1666560406 is a wasteful number, since it uses less digits than its factorization.

1666560406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119040038.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 1666560406 is about 40823.5276035768. The cubic root of 1666560406 is about 1185.6059037709.

The spelling of 1666560406 in words is "one billion, six hundred sixty-six million, five hundred sixty thousand, four hundred six".