1660540566 has 16 divisors (see below), whose sum is σ = 3325708800. Its totient is φ = 552742248.

The previous prime is 1660540547. The next prime is 1660540571. The reversal of 1660540566 is 6650450661.

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, 188146 + ... + 196773.

It is an arithmetic number, because the mean of its divisors is an integer number (207856800).

Almost surely, 2^1660540566 is an apocalyptic number.

1660540566 is an abundant number, since it is smaller than the sum of its proper divisors (1665168234).

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

1660540566 is a wasteful number, since it uses less digits than its factorization.

1660540566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385643.

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 1660540566 is about 40749.7308702769. The cubic root of 1660540566 is about 1184.1766589299.

The spelling of 1660540566 in words is "one billion, six hundred sixty million, five hundred forty thousand, five hundred sixty-six".