1666694152 has 16 divisors (see below), whose sum is σ = 3149660160. Its totient is φ = 826784784.

The previous prime is 1666694143. The next prime is 1666694201. The reversal of 1666694152 is 2514966661.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 819208 + ... + 821239.

It is an arithmetic number, because the mean of its divisors is an integer number (196853760).

Almost surely, 2^1666694152 is an apocalyptic number.

It is an amenable number.

1666694152 is a deficient number, since it is larger than the sum of its proper divisors (1482966008).

1666694152 is a wasteful number, since it uses less digits than its factorization.

1666694152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640580 (or 1640576 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 1666694152 is about 40825.1656702089. The cubic root of 1666694152 is about 1185.6376189541.

The spelling of 1666694152 in words is "one billion, six hundred sixty-six million, six hundred ninety-four thousand, one hundred fifty-two".