1566279666 has 160 divisors (see below), whose sum is σ = 4290485760. Its totient is φ = 416876544.

The previous prime is 1566279641. The next prime is 1566279707. The reversal of 1566279666 is 6669726651.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2178055 + ... + 2178773.

It is an arithmetic number, because the mean of its divisors is an integer number (26815536).

Almost surely, 2^1566279666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1566279666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145242880).

1566279666 is an abundant number, since it is smaller than the sum of its proper divisors (2724206094).

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

1566279666 is a wasteful number, since it uses less digits than its factorization.

1566279666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 861 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 1566279666 is about 39576.2512878620. The cubic root of 1566279666 is about 1161.3321165913.

The spelling of 1566279666 in words is "one billion, five hundred sixty-six million, two hundred seventy-nine thousand, six hundred sixty-six".