1566156666 has 16 divisors (see below), whose sum is σ = 3148056000. Its totient is φ = 519428448.

The previous prime is 1566156617. The next prime is 1566156667. The reversal of 1566156666 is 6666516651.

It is not an unprimeable number, because it can be changed into a prime (1566156667) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 654651 + ... + 657038.

It is an arithmetic number, because the mean of its divisors is an integer number (196753500).

Almost surely, 2^1566156666 is an apocalyptic number.

1566156666 is an abundant number, since it is smaller than the sum of its proper divisors (1581899334).

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

1566156666 is a wasteful number, since it uses less digits than its factorization.

1566156666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311893.

The product of its digits is 1166400, while the sum is 48.

The square root of 1566156666 is about 39574.6972951152. The cubic root of 1566156666 is about 1161.3017159775.

It can be divided in two parts, 15661 and 56666, that added together give a palindrome (72327).

The spelling of 1566156666 in words is "one billion, five hundred sixty-six million, one hundred fifty-six thousand, six hundred sixty-six".