1666498966 has 16 divisors (see below), whose sum is σ = 2742767568. Its totient is φ = 753119200.

The previous prime is 1666498963. The next prime is 1666498979. The reversal of 1666498966 is 6698946661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666498963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215125 + ... + 222736.

It is an arithmetic number, because the mean of its divisors is an integer number (171422973).

Almost surely, 2^1666498966 is an apocalyptic number.

1666498966 is a deficient number, since it is larger than the sum of its proper divisors (1076268602).

1666498966 is a wasteful number, since it uses less digits than its factorization.

1666498966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438047.

The product of its digits is 20155392, while the sum is 61.

The square root of 1666498966 is about 40822.7750894032. The cubic root of 1666498966 is about 1185.5913339376.

The spelling of 1666498966 in words is "one billion, six hundred sixty-six million, four hundred ninety-eight thousand, nine hundred sixty-six".