1666379522 has 8 divisors (see below), whose sum is σ = 2500082172. Its totient is φ = 833018800.

The previous prime is 1666379521. The next prime is 1666379531. The reversal of 1666379522 is 2259736661.

It can be written as a sum of positive squares in 2 ways, for example, as 1657385521 + 8994001 = 40711^2 + 2999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1666379522² = 5553641422681896968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666379521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72929 + ... + 93012.

Almost surely, 2^1666379522 is an apocalyptic number.

1666379522 is a deficient number, since it is larger than the sum of its proper divisors (833702650).

1666379522 is a wasteful number, since it uses less digits than its factorization.

1666379522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170964.

The product of its digits is 816480, while the sum is 47.

The square root of 1666379522 is about 40821.3121053207. The cubic root of 1666379522 is about 1185.5630080565.

The spelling of 1666379522 in words is "one billion, six hundred sixty-six million, three hundred seventy-nine thousand, five hundred twenty-two".