1666215066 has 16 divisors (see below), whose sum is σ = 3333391488. Its totient is φ = 555244800.

The previous prime is 1666215053. The next prime is 1666215077. The reversal of 1666215066 is 6605126661.

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, 16455 + ... + 60026.

It is an arithmetic number, because the mean of its divisors is an integer number (208336968).

Almost surely, 2^1666215066 is an apocalyptic number.

1666215066 is an abundant number, since it is smaller than the sum of its proper divisors (1667176422).

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

1666215066 is a wasteful number, since it uses less digits than its factorization.

1666215066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80117.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 1666215066 is about 40819.2977156638. The cubic root of 1666215066 is about 1185.5240054640.

The spelling of 1666215066 in words is "one billion, six hundred sixty-six million, two hundred fifteen thousand, sixty-six".