1566650660 has 12 divisors (see below), whose sum is σ = 3289966428. Its totient is φ = 626660256.

The previous prime is 1566650653. The next prime is 1566650663. The reversal of 1566650660 is 660566651.

It can be written as a sum of positive squares in 2 ways, for example, as 1148938816 + 417711844 = 33896^2 + 20438^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1566650663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39166247 + ... + 39166286.

It is an arithmetic number, because the mean of its divisors is an integer number (274163869).

Almost surely, 2^1566650660 is an apocalyptic number.

1566650660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1566650660 is an abundant number, since it is smaller than the sum of its proper divisors (1723315768).

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

1566650660 is a wasteful number, since it uses less digits than its factorization.

1566650660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78332542 (or 78332540 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 1566650660 is about 39580.9380889337. The cubic root of 1566650660 is about 1161.4238016298.

The spelling of 1566650660 in words is "one billion, five hundred sixty-six million, six hundred fifty thousand, six hundred sixty".