1666430145 has 16 divisors (see below), whose sum is σ = 2962542720. Its totient is φ = 888762672.

The previous prime is 1666430113. The next prime is 1666430153. The reversal of 1666430145 is 5410346661.

It is a happy number.

It is not a de Polignac number, because 1666430145 - 2⁵ = 1666430113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6171829 + ... + 6172098.

It is an arithmetic number, because the mean of its divisors is an integer number (185158920).

Almost surely, 2^1666430145 is an apocalyptic number.

1666430145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666430145 is a deficient number, since it is larger than the sum of its proper divisors (1296112575).

1666430145 is a wasteful number, since it uses less digits than its factorization.

1666430145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12343941 (or 12343935 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1666430145 is about 40821.9321566238. The cubic root of 1666430145 is about 1185.5750133546.

The spelling of 1666430145 in words is "one billion, six hundred sixty-six million, four hundred thirty thousand, one hundred forty-five".