1666250290 has 8 divisors (see below), whose sum is σ = 2999250540. Its totient is φ = 666500112.

The previous prime is 1666250213. The next prime is 1666250293. The reversal of 1666250290 is 920526661.

It can be written as a sum of positive squares in 2 ways, for example, as 1618211529 + 48038761 = 40227^2 + 6931^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1666250293) 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, 83312505 + ... + 83312524.

Almost surely, 2^1666250290 is an apocalyptic number.

1666250290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666250290 is a deficient number, since it is larger than the sum of its proper divisors (1333000250).

1666250290 is a wasteful number, since it uses less digits than its factorization.

1666250290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166625036.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 1666250290 is about 40819.7291759757. The cubic root of 1666250290 is about 1185.5323594483.

The spelling of 1666250290 in words is "one billion, six hundred sixty-six million, two hundred fifty thousand, two hundred ninety".