1666666450 has 12 divisors (see below), whose sum is σ = 3099999690. Its totient is φ = 666666560.

The previous prime is 1666666427. The next prime is 1666666459. The reversal of 1666666450 is 546666661.

It can be written as a sum of positive squares in 3 ways, for example, as 1002418921 + 664247529 = 31661^2 + 25773^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1666666450.

It is not an unprimeable number, because it can be changed into a prime (1666666459) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16666615 + ... + 16666714.

Almost surely, 2^1666666450 is an apocalyptic number.

1666666450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666666450 is a deficient number, since it is larger than the sum of its proper divisors (1433333240).

1666666450 is a wasteful number, since it uses less digits than its factorization.

1666666450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33333341 (or 33333336 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 46.

The square root of 1666666450 is about 40824.8263927723. The cubic root of 1666666450 is about 1185.6310501193.

The spelling of 1666666450 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, four hundred fifty".