1566660066 has 16 divisors (see below), whose sum is σ = 3152084544. Its totient is φ = 519092624.

The previous prime is 1566660023. The next prime is 1566660097. The reversal of 1566660066 is 6600666651.

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, 780765 + ... + 782768.

It is an arithmetic number, because the mean of its divisors is an integer number (197005284).

Almost surely, 2^1566660066 is an apocalyptic number.

1566660066 is an abundant number, since it is smaller than the sum of its proper divisors (1585424478).

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

1566660066 is a wasteful number, since it uses less digits than its factorization.

1566660066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563705.

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 1566660066 is about 39581.0569085769. The cubic root of 1566660066 is about 1161.4261259791.

The spelling of 1566660066 in words is "one billion, five hundred sixty-six million, six hundred sixty thousand, sixty-six".