1566660655 has 24 divisors (see below), whose sum is σ = 2191486752. Its totient is φ = 1052865216.

The previous prime is 1566660647. The next prime is 1566660659. The reversal of 1566660655 is 5560666651.

It is not a de Polignac number, because 1566660655 - 2³ = 1566660647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566660659) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1704286 + ... + 1705204.

It is an arithmetic number, because the mean of its divisors is an integer number (91311948).

Almost surely, 2^1566660655 is an apocalyptic number.

1566660655 is a deficient number, since it is larger than the sum of its proper divisors (624826097).

1566660655 is an frugal number, since it uses more digits than its factorization.

1566660655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1903 (or 984 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 46.

The square root of 1566660655 is about 39581.0643490041. The cubic root of 1566660655 is about 1161.4262715287.

The spelling of 1566660655 in words is "one billion, five hundred sixty-six million, six hundred sixty thousand, six hundred fifty-five".